The kinesis pedals require the foot to move which is requires a lot of energy which produces a lag of about 1 second between you wanting to press a key and pressing it with your foot. This lag turned me off pedals, but in theory it sounds great.
Indeed, a pedal sounds tiresome, unless the switch pressure could be tuned so that the foot could be relaxed and require only a small pressure to activate the switch(es).
Probably not, the toes really aren't built for fine motor action the way the fingers are. You would probably get RSI pretty quickly. You'd want to stick to motions that are more typical, such as stepping the foot.
That makes me think of motorcycle foot levers, where the back of your foot is supported by and pivots around a peg, allowing you to comfortable and quickly push the lever down.
