The ability to have two foreground lighting effects per key, the first that can be triggered on key press (as it currently is), and the second to be triggered on key release.
The reason for this is you can currently have a key light up on key press the turn off on key release, which looks pretty jarring, alternatively you can have it light up for a set time on key press then slowly fade out, which looks a lot nicer but is weird if you hold the key longer than the time delay. I'd like to be able to light up on key press then fade out on key release.
