yes i know of him, i saw him at Ravenswood 18mths ago riding a Montessssa. Ross will know his name as i forget it, i think it is Ken?
I know a bloke in my club with only the left arm, he trail rides and is very fast, nothing stops him (mud, rocks, trees, steep downhills).
the left side of his bars has throttle, clutch, front brake and start button. throttle works in reverse action. He is as tough as a room full of lesbo's