We use to call it a poor mans cruise control, I use it when I light up a smoke on the road but, not smart, they will probably put that on my grave stone when I go down some day. One thing you don't want to do though, is to unscrew it too far or it will pop the retainning ring off inside the housing and the the thumb screw will vibrate out and be lost, then you'll go to the dealership to buy a new $6.00 thumb screw and end up spending over $100.00 before you get out the door. If you do want a cruise control they make some pretty good aftermarket ones that are safe or like Smitty said they make palm rest for the throttle that will give you a break on long runs.