Currently, this feature isn't supported on splits, spent about an hour troubleshooting my board and firmware before asking, and turns out it's not in place. Note added to save others from this in the future.
* First pass
* Add config options to docs
* Update some wording
* Slight tidy up of backlight caps logic
* Init pin to correct state
* Move init location
* Reverse default state
Albert Y
Dasky
aydenvis
Joel Challis