Using a wall as a touchscreen

I was wanting to project my computer onto my wall at home, and touch the wall to use my computer instead of using a mouse.
While dragging and dropping would not be a possibility, I would probably do it like these guys did:
http://waterloolabs.blogspot.com/
(See the video)
Or, for a slightly more scientific explanation, http://decibel.ni.com/content/docs/DOC-6126

My question: Do you think Freebsd would be easy to configure for a wall touching setup? Do you know if anyone's done this before? Any tips or advice?
Thanks.
 
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