Per led rgb settings, layer rgb and other indicator rgb
Per key RGB is one of the few things that is lacking in the UI in VIA and VIAL. This seems to be often requested in places like r/olkb where per key RGB seems to be one of the few things that still has to be done in code rather than ui.
Allow adjusting leds in the ui ...
Per "type" of key (Alphanumerics, modifiers, function row, num pad , navigation etc)
dependent on layer
indicator for caps lock, scroll lock, numlock