I wonder why all 4 wheeler throttles are with a lever instead of a twist type such as on a motorcycle. I am new to 4 wheelers, but when going over rough surfaces, my thumb tends to move causing me either gun engine or lose throttle as my thumb slips off or moves forward when unwanted. The motorcycle throttle seems like a more suitable control. Probably wrong, and sure a good reason to have them like they are, but just wondering as I would think I could control throttle better other way. Any comments as to a reason?