Repetitive Strain Injury (Score 1)

Hopefully the acoustic sensors can also pick up my screams of agony as I bash away on my hard-as-nails desktop, inducing even more swelling and pain without the benefit of the bio-feedback keys can give. Perhaps there could be a 'strain gauge' projected on the desk or even clicks related to the pressure used to hit the keys. Yes you should be able to mute this, but just think of the fun you would have if you linked this into a midi device. All those times you've drummed your fingers with boredom - now you could entertain everyone by tapping out Rachmaninov on your lap at the bus stop. Hang on I've hit on a solution, just project the keyboard on your thighs - instant bio-feedback and perfect keyboard posture!