Right, a thimble? I'd want it out of the way for typing and other tasks. The thumbnail is probably a good place to mount because it's not touching skin for lo

Right, a thimble? I'd want it out of the way for typing and other tasks. The thumbnail is probably a good place to mount because it's not touching skin for long periods of time, or blocking the pad of fingers. I'd test a pointing stick "eraser" or a trackball of some sort (because capacitive touchpad style won't work on everything) on the fingernail tip.