Here is something else you tech heads could look at. Apparently you can get Xbox kinect to work on a Windows 7 PC. In theory you could just use you hand to touch the screen and operate the switches? Don't know if this would work or would conflict with track IR but might be worth a play, especially if you have kinect hardware to hand - which I don't.
http://www.360-hq.com/xbox-tutorials-164.html