ok heres the best idea i can offer, its a shifter from JC-Whitney ( I LOVE THIS PLACE )
Buy one of the shifter knobs on this page and replace the 3 leds with 3 small micro buttons, and the center top has a hole, use it to place the trackpoint (like on ibm laptops) then run the wires down the shaft, and before you place the shifter knob on tight get a medium size piece of heat-shrink that will go over the shifter-shaft so when you heat it it will shink around the small wires and not be seen and WA-LA
you have a shifter withtrackpoint on top and 3 small buttons for the mouse controls and using the normal mouse software set the middle button to do something specific.
what ya think???
link:
http://www.jcwhitney.com/autoparts/P...p-7014/c-10101
chuck