Have you thought of a touchscreen?

I bought an ELO surface wave monitor from the bay, coolant, dust etc. doesn't bother it (glass screen) and you can use it with a gloved hand, just a thought.

John is right some of us are using gamepads, specifically Xbox 360 wireless types. I use one for jogging and positioning for homing and it has been faultless, I can't recall the last time I needed to use my MPG. Some have commented they are dubious as to the wireless part but I have had no trouble at all with it but then again I was very careful to make sure everything was shielded and as noise free as possible.

Jeff.