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I've just tested it out on OS X and it doesn't seem to be doing that.
Out of curiosity, are you using a Trackman? It might have something to do with it.
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I think your hands move when you hit the caps lock so fast.
And what does that have to do with my cursor moving fast?
I'm pretty sure that my thumb isn't rolling the ball so fast that I can't even notice it, especially since the trackball can't track that fast and would, for the most part, ignore such a signal.