Just wheel speed sensor would be easiest. Set the max accel to 10hp and a 250 lb load or whatever... that way guys heavier than that go faster, but the lighter guys don't gain anymore advantage (besides the inertia advantage)
Its definitely possible. You'd be amazed what you can do with this stuff. I once wrote a variable frequency drive for an ac motor completely in software... 1000hz control. And we could do it much faster with a modern micro.
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Otto - 82 Benz Turbo Diesel Wagon - cruiser
Mara - 97 BMW M3 - fun fun fun
CATIA is a dirty tramp, until you figure out its sweet spots, and how to make it moan. Then its easy as apple pie on a fall afternoon.