Good research, but I think this is one of those things that stay in the ivory tower, perhaps to one day be a shoulder for the next improvement after the mouse and trackball:<p>Mom test:
1. Mom asks how do i work this thing w/o a mouse? Tries to touch screen or look for the touch pad. Is then confused. Calls tech support (dad, then siblings... etc..)
2. Scrape fingers on table and get them calloused? No thanks. + would cost to buy more moisturizer.<p>I always love to be proven wrong though.