My troopy had a hand throttle ,,,,,,for rocky,, slow,,, even work it was fantastic, I never used it for going up or down a hill
Did freak some mates out once when I jumped out of the Troopy and started giving hand signals in front of the 4x4, mates following thought
who the hell is driving TDs 4x4 lol, was a carpark type situation, Firth Park to be exact
Try not to form bad habits they will linger