A feature … showing the D Major scale in this case. I would then be able to draw in notes and only see the keys that apply. Very useful for those of us who don’t actually play very fluently.
mod edit: post edited and thread split off from a thread in the F.R. forum
Sounds good. But I probably have an even better idea: Highlighting scales. You press a knob, a pop up menu comes up, you select a scale, for instance d major and all keys belonging to it have a slighty different color.