Another mouse alternative is the one I use, a Wacom Intuos2 graphics tablet. The mouse is two button with a clickable scroll wheel and the mouse itself is wireless. When I over do with the mouse and start to get uncomfortable I switch to the pen for a day or two and the problems go away. I find the pen takes a few minutes to get really used to, 5-10 minutes each time, but then it's quite comfortable to use. Fair winds and happy bytes, Dave Flory