Do you think there is a realistic way to take the trackball build, and add a regular mouse plate to the bottom of it?
I can't tell if there's enough pins on the Arduino, and enough room in the housing to support both. The idea is would be to use the trackball for large movements and the mouse for fine movements (and just add the x-y deltas from each).
there is not enough pins but i am looking into other boards to make it happen.