speed control?

[go_zz_go]

okay i am bored and thought about using a slide controler like the old lap tops have for the contrast or even a rotary dial to control the speed, my idea is if some how one was rigged up could and would it be posible to control the foward reverse with the thumb and with the index finger slide the dial to control speed i have no electronic know how and want to toss this out there



also if it has been covered just direct me cause i couldnt find it in the search