How about using the spare 8th (‘H’) global settings button on the keyboard model to choose different MIDI response curves for both the velocity and aftertouch actions. The user would then choose one of the 16 buttons to set increasing amounts of exponential response to the right and logarithmic to the left, with linear in the middle. Ideally pressing Shift-‘H’ multiple times would cycle between Velocity, Aftertouch and Commit, but I guess just having 8 settings each available for Velocity (white buttons) and Aftertouch (black buttons) would be better than nothing.
The reason for my suggestion is that my new Super 6 is doubling as my main studio controller keyboard, and I’ve noticed an overly lively velocity behaviour when controlling piano VSTs etc. It would be nice not to have to modify the velocity curve within the software settings of each and every virtual instrument I pull up.
Thanks if you can!