diff --git a/keyboards/a_dux/keymaps/daliusd/config.h b/keyboards/a_dux/keymaps/daliusd/config.h
new file mode 100644
index 0000000000..42e88a687f
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/config.h
@@ -0,0 +1,32 @@
+/*
+Copyright 2021 Dalius Dobravolskas <dalius.dobravolskas@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#define UNICODE_SELECTED_MODES UC_MAC, UC_LNX
+
+#define MOUSEKEY_INTERVAL 12
+#define MOUSEKEY_MAX_SPEED 6
+#define MOUSEKEY_TIME_TO_MAX 50
+
+#define MOUSEKEY_DELAY 20
+// It makes sense to use the same delay for the mouseweel
+#define MOUSEKEY_WHEEL_DELAY 100
+// The default is 100
+#define MOUSEKEY_WHEEL_INTERVAL 50
+// The default is 40
+#define MOUSEKEY_WHEEL_TIME_TO_MAX 100
diff --git a/keyboards/a_dux/keymaps/daliusd/keymap.c b/keyboards/a_dux/keymaps/daliusd/keymap.c
new file mode 100644
index 0000000000..2a65ce4580
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/keymap.c
@@ -0,0 +1,349 @@
+/* Copyright 2021 @daliusd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+#include "oneshot.h"
+
+// Each layer gets a name for readability, which is then used in the keymap matrix below.
+// The underscores don't mean anything - you can have a layer called STUFF or any other name.
+// Layer names don't all need to be of the same length, obviously, and you can also skip them
+// entirely and just use numbers.
+enum layers {
+    _QWERTY,
+    _SYM,
+    _NAV,
+    _NUMB,
+    _TMUX,
+    _MOUSE,
+    _MISC,
+    _FUNC,
+};
+
+enum custom_keycodes {
+  TM_NEXT = SAFE_RANGE,
+  TM_PREV,
+  TM_LEFT,
+  TM_RIGHT,
+  TM_NEW,
+  TM_SLCT,
+  TM_SRCH,
+  TM_URL,
+  OS_CTRL,
+  OS_ALT,
+  OS_GUI,
+  OS_TMUX,
+  OS_MISC,
+  OS_FUNC,
+};
+
+// Shortcut to make keymap more readable
+
+#define L_NAV       MO(_NAV)
+#define L_SYM       MO(_SYM)
+#define L_MOUSE     TG(_MOUSE)
+
+#define K_PRINT     (QK_LCTL | QK_LSFT | QK_LGUI | KC_4)
+
+enum unicode_names {
+    SNEK,
+    EURO,
+    LT_S_A,
+    LT_L_A,
+    LT_S_C,
+    LT_L_C,
+    LT_S_E1,
+    LT_L_E1,
+    LT_S_E2,
+    LT_L_E2,
+    LT_S_I,
+    LT_L_I,
+    LT_S_S,
+    LT_L_S,
+    LT_S_U1,
+    LT_L_U1,
+    LT_S_U2,
+    LT_L_U2,
+    LT_S_Z,
+    LT_L_Z,
+    LT_OB,
+    LT_CB,
+};
+
+const uint32_t PROGMEM unicode_map[] = {
+    [SNEK]  = 0x1F40D, // 🐍
+    [EURO]  = 0x20ac, // €
+    [LT_S_A] = 0x105, // ą
+    [LT_L_A] = 0x104, // Ą
+    [LT_S_C] = 0x10d, // č
+    [LT_L_C] = 0x10c, // Č
+    [LT_S_E1] = 0x119, // ę
+    [LT_L_E1] = 0x118, // Ę
+    [LT_S_E2] = 0x117, // ė
+    [LT_L_E2] = 0x116, // Ė
+    [LT_S_I] = 0x12f, // į
+    [LT_L_I] = 0x12e, // Į
+    [LT_S_S] = 0x161, // š
+    [LT_L_S] = 0x160, // Š'
+    [LT_S_U1] = 0x173, // ų
+    [LT_L_U1] = 0x172, // Ų
+    [LT_S_U2] = 0x16b, // ū
+    [LT_L_U2] = 0x16a, // Ū
+    [LT_S_Z] = 0x17e, // ž
+    [LT_L_Z] = 0x17d, // Ž
+    [LT_OB] = 0x201e, // „
+    [LT_CB] = 0x201c, // “
+};
+
+#define K_SNEK      X(SNEK)
+#define K_EURO      X(EURO)
+#define K_LT_A      XP(LT_S_A, LT_L_A)
+#define K_LT_C      XP(LT_S_C, LT_L_C)
+#define K_LT_E1     XP(LT_S_E1, LT_L_E1)
+#define K_LT_E2     XP(LT_S_E2, LT_L_E2)
+#define K_LT_I      XP(LT_S_I, LT_L_I)
+#define K_LT_S      XP(LT_S_S, LT_L_S)
+#define K_LT_U1     XP(LT_S_U1, LT_L_U1)
+#define K_LT_U2     XP(LT_S_U2, LT_L_U2)
+#define K_LT_Z      XP(LT_S_Z, LT_L_Z)
+#define K_LT_OB     X(LT_OB)
+#define K_LT_CB     X(LT_CB)
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+  [_QWERTY] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     KC_Q    ,KC_W    ,KC_E    ,KC_R    ,KC_T,                              KC_Y    ,KC_U    ,KC_I    ,KC_O    ,KC_P    ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_A    ,KC_S    ,KC_D    ,KC_F    ,KC_G    ,                          KC_H    ,KC_J    ,KC_K    ,KC_L    ,KC_SCLN ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_Z    ,KC_X    ,KC_C    ,KC_V    ,KC_B    ,                          KC_N    ,KC_M    ,KC_COMM ,KC_DOT  ,KC_SLSH,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     L_NAV   ,    KC_SPC  ,        KC_LSFT ,    L_SYM
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_SYM] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     KC_EXLM ,KC_AT   ,KC_HASH ,KC_DLR  ,KC_PERC ,                          KC_CIRC ,KC_AMPR ,KC_ASTR ,KC_LPRN ,KC_RPRN ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_GRV  ,KC_PLUS ,KC_LBRC ,KC_RBRC ,K_LT_OB ,                          KC_MINS ,OS_ALT  ,OS_CTRL ,OS_GUI  ,KC_PIPE ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     K_SNEK  ,KC_EQL  ,KC_LCBR ,KC_RCBR ,K_LT_CB ,                          KC_UNDS ,KC_QUOT ,KC_DQT  ,K_EURO  ,KC_BSLS ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     _______ ,    _______ ,        _______ ,    _______
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_NAV] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     KC_TILDE,L_MOUSE ,OS_FUNC ,OS_MISC ,OS_TMUX ,                          K_LT_A  ,K_LT_C  ,K_LT_E1 ,K_LT_E2 ,K_LT_I  ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_TAB  ,OS_GUI  ,OS_CTRL ,OS_ALT  ,KC_ENT  ,                          KC_LEFT ,KC_DOWN ,KC_UP   ,KC_RIGHT,KC_END  ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_DELT ,KC_BSPC ,KC_ESC  ,KC_PGDN ,KC_PGUP ,                          KC_HOME ,K_LT_S  ,K_LT_U1 ,K_LT_U2 ,K_LT_Z  ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     _______ ,    _______ ,        _______ ,    _______
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_NUMB] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     KC_1    ,KC_2    ,KC_3    ,KC_4    ,KC_5    ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_6    ,KC_7    ,KC_8    ,KC_9    ,KC_0    ,                          XXXXXXX ,OS_ALT  ,OS_CTRL ,OS_GUI  ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     KC_DELT ,KC_BSPC ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     _______ ,    _______ ,        _______ ,    _______
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_TMUX] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,TM_URL  ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          TM_LEFT ,TM_NEXT ,TM_PREV ,TM_RIGHT,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          TM_NEW  ,TM_SLCT ,XXXXXXX ,XXXXXXX ,TM_SRCH ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     XXXXXXX ,    XXXXXXX ,        XXXXXXX ,    XXXXXXX
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_MOUSE] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     XXXXXXX ,L_MOUSE ,KC_MS_U ,KC_BTN3 ,KC_WH_U ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,KC_MS_L ,KC_MS_D ,KC_MS_R ,KC_WH_D ,                          XXXXXXX ,KC_LALT ,KC_LCTL ,KC_LGUI ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,KC_ESC  ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     KC_BTN1 ,    KC_BTN2 ,        XXXXXXX ,    XXXXXXX
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_MISC] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     RESET   ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_BRID ,KC_BRIU ,XXXXXXX ,KC_PSCR ,K_PRINT ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,DEBUG   ,XXXXXXX ,XXXXXXX ,                          KC_MPRV ,KC_MPLY ,XXXXXXX ,KC_MNXT ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_VOLD ,KC_VOLU ,XXXXXXX ,XXXXXXX ,UC_MOD  ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     XXXXXXX ,    XXXXXXX ,        XXXXXXX ,    XXXXXXX
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_FUNC] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_F1   ,KC_F2   ,KC_F3   ,KC_F4   ,KC_F5   ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_F6   ,KC_F7   ,KC_F8   ,KC_F9   ,KC_F10  ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_F11  ,KC_F12  ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     XXXXXXX ,    XXXXXXX ,        XXXXXXX ,    XXXXXXX
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+};
+
+#define TMUX_PREFIX SS_DOWN(X_LCTL) "b" SS_UP(X_LCTL)
+
+bool is_oneshot_cancel_key(uint16_t keycode) {
+    switch (keycode) {
+    case L_SYM:
+    case L_NAV:
+        return true;
+    default:
+        return false;
+    }
+}
+
+bool is_oneshot_layer_cancel_key(uint16_t keycode) {
+    switch (keycode) {
+    case L_SYM:
+    case L_NAV:
+        return true;
+    default:
+        return false;
+    }
+}
+
+bool is_oneshot_ignored_key(uint16_t keycode) {
+    switch (keycode) {
+    case L_SYM:
+    case L_NAV:
+    case OS_CTRL:
+    case OS_ALT:
+    case OS_GUI:
+    case OS_TMUX:
+    case OS_MISC:
+    case KC_LSFT:
+        return true;
+    default:
+        return false;
+    }
+}
+
+bool is_oneshot_mod_key(uint16_t keycode) {
+    switch (keycode) {
+    case OS_CTRL:
+    case OS_ALT:
+    case OS_GUI:
+        return true;
+    default:
+        return false;
+    }
+}
+
+oneshot_state os_ctrl_state = os_up_unqueued;
+oneshot_state os_alt_state = os_up_unqueued;
+oneshot_state os_cmd_state = os_up_unqueued;
+oneshot_state os_tmux_state = os_up_unqueued;
+oneshot_state os_misc_state = os_up_unqueued;
+oneshot_state os_func_state = os_up_unqueued;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    update_oneshot(
+        &os_ctrl_state, KC_LCTL, OS_CTRL,
+        keycode, record
+    );
+    update_oneshot(
+        &os_alt_state, KC_LALT, OS_ALT,
+        keycode, record
+    );
+    update_oneshot(
+        &os_cmd_state, KC_LGUI, OS_GUI,
+        keycode, record
+    );
+
+    bool handled = true;
+    handled = update_oneshot_layer(
+        &os_tmux_state, _TMUX, OS_TMUX,
+        keycode, record
+    ) & handled;
+
+    handled = update_oneshot_layer(
+        &os_misc_state, _MISC, OS_MISC,
+        keycode, record
+    ) & handled;
+
+    handled = update_oneshot_layer(
+        &os_func_state, _FUNC, OS_FUNC,
+        keycode, record
+    ) & handled;
+    if (!handled) return false;
+
+    switch (keycode) {
+        case TM_LEFT:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX "<");
+            return false;
+        case TM_RIGHT:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX ">");
+            return false;
+        case TM_NEXT:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX "n");
+            return false;
+        case TM_PREV:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX "p");
+            return false;
+        case TM_NEW:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX "c");
+            return false;
+        case TM_SLCT:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX "[");
+            return false;
+        case TM_SRCH:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX "\t");
+            return false;
+        case TM_URL:
+            if (!record->event.pressed) return true;
+            SEND_STRING(TMUX_PREFIX SS_LCTL("u"));
+            return false;
+    }
+    return true;
+}
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+    return update_tri_layer_state(state, _SYM, _NAV, _NUMB);
+}
diff --git a/keyboards/a_dux/keymaps/daliusd/oneshot.c b/keyboards/a_dux/keymaps/daliusd/oneshot.c
new file mode 100644
index 0000000000..1e7b4d9650
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/oneshot.c
@@ -0,0 +1,195 @@
+/* Copyright 2021 @daliusd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "print.h"
+#include "oneshot.h"
+
+void update_oneshot(
+    oneshot_state *state,
+    uint16_t mod,
+    uint16_t trigger,
+    uint16_t keycode,
+    keyrecord_t *record
+) {
+    if (keycode == trigger) {
+        if (record->event.pressed) {
+            // Trigger keydown
+            if (*state == os_up_unqueued) {
+                register_code(mod);
+            }
+            *state = os_down_unused;
+            dprintf("trigger down (on?), mod: %d, ? -> os_down_unused\n", mod);
+        } else {
+            // Trigger keyup
+            switch (*state) {
+            case os_down_unused:
+                // If we didn't use the mod while trigger was held, queue it.
+                *state = os_up_queued;
+                dprintf("trigger up, mod: %d, os_down_unused -> os_up_queued\n", mod);
+                break;
+            case os_down_used:
+                // If we did use the mod while trigger was held, unregister it.
+                *state = os_up_unqueued;
+                unregister_code(mod);
+                dprintf("trigger up (off), mod: %d, os_down_used -> os_up_unqueued\n", mod);
+                break;
+            default:
+                break;
+            }
+        }
+    } else {
+        if (record->event.pressed) {
+            if (is_oneshot_cancel_key(keycode) && *state != os_up_unqueued) {
+                // Cancel oneshot on designated cancel keydown.
+                *state = os_up_unqueued;
+                unregister_code(mod);
+                dprintf("cancel (off), mod: %d, ? -> os_up_unqueued\n", mod);
+            }
+            if (!is_oneshot_ignored_key(keycode)) {
+                switch (*state) {
+                case os_up_queued:
+                    *state = os_up_queued_used;
+                    dprintf("key up (off), mod: %d, os_up_queued -> os_up_queued_used\n", mod);
+                    break;
+                case os_up_queued_used:
+                    *state = os_up_unqueued;
+                    unregister_code(mod);
+                    dprintf("key up (off), mod: %d, os_up_queued_used -> os_up_unqueued\n", mod);
+                    break;
+                default:
+                    break;
+                }
+            }
+        } else {
+            if (!is_oneshot_ignored_key(keycode)) {
+                // On non-ignored keyup, consider the oneshot used.
+                switch (*state) {
+                case os_down_unused:
+                    *state = os_down_used;
+                    dprintf("key up, mod: %d, os_down_unused -> os_down_used\n", mod);
+                    break;
+                case os_up_queued:
+                    *state = os_up_unqueued;
+                    unregister_code(mod);
+                    dprintf("key up (off), mod: %d, os_up_queued -> os_up_unqueued\n", mod);
+                    break;
+                case os_up_queued_used:
+                    *state = os_up_unqueued;
+                    unregister_code(mod);
+                    dprintf("key up (off), mod: %d, os_up_queued_used -> os_up_unqueued\n", mod);
+                    break;
+                default:
+                    break;
+                }
+            }
+        }
+    }
+}
+
+bool update_oneshot_layer(
+    oneshot_state *state,
+    uint16_t layer,
+    uint16_t trigger,
+    uint16_t keycode,
+    keyrecord_t *record
+) {
+    if (keycode == trigger) {
+        if (record->event.pressed) {
+            // Trigger keydown
+            if (*state == os_up_unqueued) {
+                layer_on(layer);
+            }
+            *state = os_down_unused;
+            dprintf("trigger down (on?), layer: %d, ? -> os_down_unused\n", layer);
+            return false;
+        } else {
+            // Trigger keyup
+            switch (*state) {
+            case os_down_unused:
+                // If we didn't use the layer while trigger was held, queue it.
+                *state = os_up_queued;
+                dprintf("trigger up, layer: %d, os_down_unused -> os_up_queued\n", layer);
+                return false;
+            case os_down_used:
+                // If we did use the layer while trigger was held, turn off it.
+                *state = os_up_unqueued;
+                layer_off(layer);
+                dprintf("trigger up (off), layer: %d, os_down_used -> os_up_unqueued\n", layer);
+                return false;
+            default:
+                break;
+            }
+        }
+    } else {
+        if (record->event.pressed) {
+            if (is_oneshot_layer_cancel_key(keycode) && *state != os_up_unqueued) {
+                // Cancel oneshot layer on designated cancel keydown.
+                *state = os_up_unqueued;
+                layer_off(layer);
+                dprintf("cancel (off), layer: %d, ? -> os_up_unqueued\n", layer);
+                return false;
+            }
+            uint8_t key_layer = read_source_layers_cache(record->event.key);
+            if (key_layer == layer) {
+                // On non-ignored keyup, consider the oneshot used.
+                switch (*state) {
+                case os_down_unused:
+                    *state = os_down_used;
+                    dprintf("key down, layer: %d, os_down_unused -> os_down_used\n", layer);
+                    return true;
+                case os_up_queued:
+                    if (is_oneshot_mod_key(keycode)) {
+                        *state = os_up_unqueued;
+                        layer_off(layer);
+                        dprintf("key down, layer: %d, os_up_queued -> os_up_unqueued\n", layer);
+                        return false;
+                    } else {
+                        *state = os_up_queued_used;
+                        dprintf("key down, layer: %d, os_up_queued -> os_up_queued_used\n", layer);
+                    }
+                    return true;
+               case os_up_queued_used:
+                    *state = os_up_unqueued;
+                    layer_off(layer);
+                    dprintf("key down (off), layer: %d, os_up_queued_used -> os_up_unqueued\n", layer);
+                    return false;
+                default:
+                    break;
+                }
+            }
+        } else {
+            // Ignore key ups from other layers
+            uint8_t key_layer = read_source_layers_cache(record->event.key);
+            if (key_layer == layer) {
+                // On non-ignored keyup, consider the oneshot used.
+                switch (*state) {
+                case os_up_queued:
+                    *state = os_up_unqueued;
+                    layer_off(layer);
+                    dprintf("key up (off), layer: %d, os_up_queued -> os_up_unqueued\n", layer);
+                    return true;
+                case os_up_queued_used:
+                    *state = os_up_unqueued;
+                    layer_off(layer);
+                    dprintf("key up (off), layer: %d, os_up_queued_used -> os_up_unqueued\n", layer);
+                    return true;
+                default:
+                    break;
+                }
+            }
+        }
+    }
+    return true;
+}
diff --git a/keyboards/a_dux/keymaps/daliusd/oneshot.h b/keyboards/a_dux/keymaps/daliusd/oneshot.h
new file mode 100644
index 0000000000..a4ea71b8a7
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/oneshot.h
@@ -0,0 +1,65 @@
+/* Copyright 2021 @daliusd
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include QMK_KEYBOARD_H
+
+// Represents the four states a oneshot key can be in
+typedef enum {
+    os_up_unqueued,
+    os_up_queued,
+    os_up_queued_used,
+    os_down_unused,
+    os_down_used,
+} oneshot_state;
+
+// Custom oneshot mod implementation that doesn't rely on timers. If a mod is
+// used while it is held it will be unregistered on keyup as normal, otherwise
+// it will be queued and only released after the next non-mod keyup.
+void update_oneshot(
+    oneshot_state *state,
+    uint16_t mod,
+    uint16_t trigger,
+    uint16_t keycode,
+    keyrecord_t *record
+);
+
+// Oneshot implementation for layers
+bool update_oneshot_layer(
+    oneshot_state *state,
+    uint16_t layer,
+    uint16_t trigger,
+    uint16_t keycode,
+    keyrecord_t *record
+);
+
+// To be implemented by the consumer. Layers one shot implementation needs to
+// know which keys are used as oneshot mods
+bool is_oneshot_mod_key(
+    uint16_t keycode
+);
+
+// To be implemented by the consumer. Defines keys to cancel oneshot mods.
+bool is_oneshot_cancel_key(uint16_t keycode);
+
+// To be implemented by the consumer. Defines keys to cancel oneshot layers.
+bool is_oneshot_layer_cancel_key(uint16_t keycode);
+
+// To be implemented by the consumer. Defines keys to ignore when determining
+// whether a oneshot mod has been used. Setting this to modifiers and layer
+// change keys allows stacking multiple oneshot modifiers, and carrying them
+// between layers.
+bool is_oneshot_ignored_key(uint16_t keycode);
diff --git a/keyboards/a_dux/keymaps/daliusd/readme.md b/keyboards/a_dux/keymaps/daliusd/readme.md
new file mode 100644
index 0000000000..f6e0efd0e8
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/readme.md
@@ -0,0 +1,21 @@
+# My 34 keys layout
+
+This are my principles for layout:
+
+* I am using Callum style layout. Here you can read explanation by
+  Callum himself and his reasoning for not using mod-tap:
+  [here](../../../../users/callum/readme.md)
+
+* There should be only one way to type key. Key can be on
+  different layer but it must maintain its physical location.
+
+* The less features are used the better.
+
+* trilayer is cool.
+
+* There is 🐍 key for no reason.
+
+As well I have added one shot layers compatible with Callum's one
+shot keys.
+
+There is simple TMUX layer as well.
diff --git a/keyboards/a_dux/keymaps/daliusd/rules.mk b/keyboards/a_dux/keymaps/daliusd/rules.mk
new file mode 100644
index 0000000000..0f203f004c
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/rules.mk
@@ -0,0 +1,5 @@
+UNICODE_ENABLE = no
+UNICODEMAP_ENABLE = yes
+#CONSOLE_ENABLE = yes
+
+SRC += oneshot.c
diff --git a/keyboards/lets_split/keymaps/shaymdev/config.h b/keyboards/lets_split/keymaps/shaymdev/config.h
new file mode 100644
index 0000000000..300dc47c2e
--- /dev/null
+++ b/keyboards/lets_split/keymaps/shaymdev/config.h
@@ -0,0 +1,60 @@
+/*
+This is the c configuration file for the keymap
+
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2015 Jack Humbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+/* Use I2C or Serial, not both */
+#define USE_SERIAL
+// #define USE_I2C
+
+/* Select hand configuration */
+#define MASTER_LEFT
+// #define _MASTER_RIGHT
+// #define EE_HANDS
+
+#undef RGB_DI_PIN
+#define RGB_DI_PIN D3
+#undef RGBLED_NUM
+#define RGBLIGHT_EFFECT_BREATHING
+#define RGBLIGHT_EFFECT_RAINBOW_MOOD
+#define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+#define RGBLIGHT_EFFECT_SNAKE
+#define RGBLIGHT_EFFECT_KNIGHT
+#define RGBLIGHT_EFFECT_STATIC_GRADIENT
+#define RGBLED_NUM 10
+
+#define RGBLIGHT_LAYERS
+#define RGBLIGHT_LAYERS_OVERRIDE_RGB_OFF
+#define RGBLIGHT_SLEEP
+
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(PLANCK_SOUND)
+    // #define STARTUP_SONG SONG(NO_SOUND)
+
+    #define DEFAULT_LAYER_SONGS { SONG(QWERTY_SOUND), \
+                                  SONG(COLEMAK_SOUND), \
+                                  SONG(DVORAK_SOUND) \
+                                }
+#endif
+
+#define COMBO_COUNT 1
+
+#define IGNORE_MOD_TAP_INTERRUPT
+#define TAPPING_TERM 220
diff --git a/keyboards/lets_split/keymaps/shaymdev/keymap.c b/keyboards/lets_split/keymaps/shaymdev/keymap.c
new file mode 100644
index 0000000000..7ab16b3fe3
--- /dev/null
+++ b/keyboards/lets_split/keymaps/shaymdev/keymap.c
@@ -0,0 +1,188 @@
+/* Copyright 2021 Shay Merrill
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+
+enum lets_split_layers {
+  _DVORAK,
+  _QWERTY,
+  _LOWER,
+  _RAISE,
+  _ADJUST
+};
+
+enum custom_keycodes {
+  DVORAK = SAFE_RANGE,
+  QWERTY
+};
+
+#define TO_DV TO(_DVORAK)
+#define LOWER MO(_LOWER)
+#define LWR LOWER
+#define RAISE MO(_RAISE)
+#define RAS RAISE
+
+enum combos //match combo_count in config.h
+{
+	EU_ENT,
+};
+
+const uint16_t PROGMEM eu_combo[]     = {KC_E, KC_U, COMBO_END};
+
+combo_t key_combos[COMBO_COUNT] = {
+	[EU_ENT]                = COMBO_ACTION(eu_combo),
+};
+
+void process_combo_event(uint16_t combo_index, bool pressed) {
+  switch(combo_index) {
+    case EU_ENT:
+      if (pressed) {
+        tap_code16(KC_ENT);
+      }
+      break;
+  }
+}
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+[_DVORAK] = LAYOUT( 
+  KC_ESC,  KC_QUOT, KC_COMM, KC_DOT, KC_P,    KC_Y,        KC_F,    KC_G,   KC_C,  KC_R,   KC_L,    KC_SLSH, 
+  KC_TAB,  KC_A,    KC_O,    KC_E,   KC_U,    KC_I,        KC_D,    KC_H,   KC_T,  KC_N,   KC_S,    KC_MINS, 
+  KC_EQL,  KC_SCLN, KC_Q,    KC_J,   KC_K,    KC_X,        KC_B,    KC_M,   KC_W,  KC_V,   KC_Z,    KC_BSLS, 
+  XXXXXXX, KC_ENT,  KC_LALT, TT(LWR), KC_LSFT, KC_LCTL,		 KC_BSPC, KC_SPC, TT(RAS), KC_DEL, KC_LGUI, XXXXXXX  
+),
+
+[_QWERTY] = LAYOUT( 
+  KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    	  KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC, 
+  KC_TAB,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    	  KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, 
+  KC_LCTL, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    	  KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_LGUI,
+  _______, _______, _______, _______, _______, _______,     _______, _______, _______, _______, _______, _______
+),
+
+[_LOWER] = LAYOUT( 
+  _______, KC_EXLM, KC_AT,   KC_LCBR, KC_RCBR, KC_AMPR,     _______, KC_P7,   KC_P8, KC_P9, KC_PMNS, _______, 
+  _______, KC_HASH, KC_DLR,  KC_LPRN, KC_RPRN, KC_ASTR, 		_______, KC_P4,   KC_P5, KC_P6, KC_PPLS, _______, 
+  _______, KC_PERC, KC_CIRC, KC_LBRC, KC_RBRC, KC_GRV,			_______, KC_P1,   KC_P2, KC_P3, KC_PENT, _______, 
+  _______, _______, _______, _______, _______, _______,     _______, KC_KP_0, _______, _______, _______, _______ //This kp_0 is blocking the space key.... may want to do something about that.
+),
+
+[_RAISE] = LAYOUT( 
+  _______, KC_PSCR, KC_HOME, KC_UP,   KC_END,  KC_PGUP,  		KC_VOLU, KC_F7,   KC_F8,   KC_F9,   KC_F10,  XXXXXXX,
+  KC_CAPS, KC_INS,  KC_LEFT, KC_DOWN, KC_RGHT, KC_PGDN,  	 	KC_VOLD, KC_F4,   KC_F5,   KC_F6,   KC_F11,  XXXXXXX,
+  _______, KC_NLCK, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,  	 	KC_MUTE, KC_F1,   KC_F2,   KC_F3,   KC_F12,  XXXXXXX,
+  _______, _______, _______, _______, _______, _______,     _______, _______, _______, _______, _______, _______
+),
+
+[_ADJUST] =  LAYOUT( 
+    TO_DV, RESET,   _______, _______, _______, _______, 		_______, _______, _______, _______, _______, KC_DEL,  
+  RGB_TOG, RGB_MOD, VLK_TOG, AU_ON,   AU_OFF,  AG_NORM, 		AG_SWAP,  QWERTY,  DVORAK, _______, _______, _______, 
+  RGB_HUI, RGB_HUD, RGB_SAI, RGB_SAD, RGB_VAI, RGB_VAD, 		_______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY, 
+  _______, _______, _______, _______, _______, _______,     _______, _______, _______, _______, _______, _______
+)
+
+};
+
+const key_override_t delete_key_override = ko_make_basic(MOD_MASK_SHIFT, KC_BSPACE, KC_DELETE);
+
+// This globally defines all key overrides to be used
+const key_override_t **key_overrides = (const key_override_t *[]){
+    &delete_key_override,
+    NULL // Null terminate the array of overrides!
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+  case QWERTY:
+    if (record->event.pressed) {
+      set_single_persistent_default_layer(_QWERTY);
+    }
+    return false;
+    break;
+  case DVORAK:
+    if (record->event.pressed) {
+      set_single_persistent_default_layer(_DVORAK);
+    }
+    return false;
+    break;
+  }
+  return true;
+}
+
+
+#ifdef RGBLIGHT_ENABLE
+
+const rgblight_segment_t PROGMEM my_capslock_layer[] = RGBLIGHT_LAYER_SEGMENTS(
+    {4, 2, HSV_RED}       // Light 2 LEDs, starting with LED 4
+);
+
+const rgblight_segment_t PROGMEM my_qwerty_layer[] = RGBLIGHT_LAYER_SEGMENTS(
+    {0, 3, HSV_CHARTREUSE}       // Light 3 LEDs, starting with LED 0
+);
+
+const rgblight_segment_t PROGMEM my_lower_layer[] = RGBLIGHT_LAYER_SEGMENTS(
+    {3, 2, HSV_BLUE}    // Light LEDs 3-4
+);
+
+const rgblight_segment_t PROGMEM my_raise_layer[] = RGBLIGHT_LAYER_SEGMENTS(
+    {5, 2, HSV_ORANGE}    // Light LEDs 5-6
+);
+
+const rgblight_segment_t PROGMEM my_adjust_layer[] = RGBLIGHT_LAYER_SEGMENTS(
+    {3, 4, HSV_GREEN}       // Light 4 LEDs, starting with LED 3
+);
+
+
+//Later layers take precedence. This array corresponds to the magic numbers used in rgblight_set_layer_state(i, onOff)
+const rgblight_segment_t* const PROGMEM my_rgb_layers[] = RGBLIGHT_LAYERS_LIST(
+    my_capslock_layer,
+    my_qwerty_layer,   // Overrides other layers
+    my_lower_layer,    // Overrides other layers
+    my_raise_layer,    // Overrides other layers
+    my_adjust_layer    // Overrides other layers
+);
+
+void keyboard_post_init_user(void) {
+    // Enable the LED layers
+    rgblight_layers = my_rgb_layers;
+    rgblight_disable_noeeprom(); // disables RGB, without saving settings
+    //rgblight_sethsv_noeeprom(HSV_CYAN);
+    //rgblight_mode_noeeprom(RGBLIGHT_MODE_STATIC_LIGHT);
+    // rgblight_mode_noeeprom(RGBLIGHT_MODE_RAINBOW_SWIRL);
+}
+
+bool led_update_user(led_t led_state) {
+    rgblight_set_layer_state(0, led_state.caps_lock);
+    return true;
+}
+
+layer_state_t default_layer_state_set_user(layer_state_t state) {
+    rgblight_set_layer_state(1, layer_state_cmp(state, _QWERTY));
+    return state;
+}
+
+#endif
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+    state = update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
+
+#ifdef RGBLIGHT_ENABLE
+    rgblight_set_layer_state(2, layer_state_cmp(state, _LOWER));
+    rgblight_set_layer_state(3, layer_state_cmp(state, _RAISE));
+    rgblight_set_layer_state(4, layer_state_cmp(state, _ADJUST));
+#endif
+
+  return state;
+}
diff --git a/keyboards/lets_split/keymaps/shaymdev/rules.mk b/keyboards/lets_split/keymaps/shaymdev/rules.mk
new file mode 100644
index 0000000000..3d737cbb48
--- /dev/null
+++ b/keyboards/lets_split/keymaps/shaymdev/rules.mk
@@ -0,0 +1,5 @@
+RGBLIGHT_ENABLE = yes
+VELOCIKEY_ENABLE = yes
+KEY_OVERRIDE_ENABLE = yes
+COMBO_ENABLE = yes
+LTO_ENABLE = yes