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When I started to get some pain in my wrists, I noticed it most when I was using photoshop and clicking a great deal. I tore apart an old USB mouse and wired a pair of foot switches in so I could click with my feet as well. It helped quite a bit. Now I rather prefer it, especially the right click action.

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That's a really fun idea. I wonder how you could control programs differently with 2 or even 4 input devices?

Ie, twin cursors on the screen, each controlled by a separate mouse? Tablets introduced a number of interesting new interface mechanisms - double tap, pinch, stretch etc. Could we bring these to non touch-screens?

Sure, have a look at ICon (for instance) if you want to add custom input devices to your setup : http://inputconf.sourceforge.net/

Do you play the piano? I wonder if doing something like this would affect or improve your ability to play piano. I always found one of the hardest things to learn was the pedal rhythm while playing.

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