I'm finally watching the NASA videos of the robot flight. One of the other teams was trying to use a USB mouse on their laptop. Oddly enough, they don't seem to work very well in freefall.
Actually, an optical mouse would probably work slightly better -- you need to apply less pressure to keep it against the surface. Any mouse, though, wouldn't really work -- you have to keep track of it, or it'll float away, and it's very much dependent on your orientation in general. I think a pen tablet would be slightly less pessimal, assuming a tethered pen, but mostly only because it'd be more forgiving of odd orientations -- the same issues about pressure against a specific surface still apply.
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actually, that gives me a good R&D idea: hardware interfaces for freefall...
(I found even key-pressing to be kind of difficult with my feet in the air. If I knew how to use a Twiddler, that'd be a good place for it.)
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It's fruitcake all the way down. (http://homepages.tesco.net/~janefisk/discworld/discworld.htm)