The best way to handle your hands off gas control would be for game makers to just make a cruise control button.
Cars in games control just like in real life, you press the gas pedal to go, and as long as you are pressing that pedal, you keep going.
You want to slow down a little, then you let go, you want to stop then hit the break. If it's not to complicated to do in a car, then why would that be complicated in a game?
Next you are gonna want Manual Shift that does it Automatically so that you can have better control without actually having control.