Would be great, but I'm afraid that the internal communication for buttons, LEDs and remote control is not based on midi commands and cannot be transferred to the KPA's USB-in/out communication.
I guess they already wrapped their internal functions into a MIDI API, so wrapping them into a serial / USB API would not be this far away. Basically the command coming over USB just calls some internal function, which would be the same one, as if the command came from a button or the remote (or MIDI).
P.S. They are already using this functionality in RigManager. They just would have to extend this API to be able to control internal parameters than just moving / copying rigs and performances. Maybe they already prepared this but a GUI editor wasn't high priority for them yet.