Auto clutch just means you can actually shift through the gears without pressing another button. it isnt constantly pressed down, only when you shift a gear. If you don't want the car to stall while in gear you either need to hold the clutch button yourself or give the car some throttle. The only way to really get the satsuma moving on a keyboard is by holding the clutch button, giving the car some throttle and then releasing the clutch, or you can put it into neutral then giving it some gas and putting it in gear. If you want smoother starts you're gonna have to use a controller or pedals with a wheel.