Awesome. I want to marry this with a concept I had a while ago around a computer keyboard with pressure sensitivity that adjusted the font size in proportion to how hard you struck the keys.

I like the idea of being able to enter into BILLY MAYS MODE just by furiously typing.

You might have to mess around with the software to figure out the details, but from a hardware perspective a hall effect keyboard should be at least able to infer the speed a key is travelling at when bottoms out.