[sqrt17]

Actually, a midi keyboard has a longer way from keyup to keydown because you need to express differences in the velocities.

Then again, many more people have midi keyboards than steno machines, so it might be worth the try to adapt it for plover.

An even more awesome idea would be to use something like the EWI or the Eigenharp pico as a steno device, since those are more portable than either a midi keyboard or a normal keyboard. Not sure about the Eigenharp, but for the EWI you'd have to use another firmware (than the current one which translates fingerings into single midi notes and doesn't support chording), which sadly puts it out of the frame.