[jhautz]

What samus said and what I said are the same thing. It just controls how quickly the motor can spin up to speed and therefor controling the power at take off. It does however control the acceleration rate all the way up to the top speed, not just at the bottom end take off.

You can do the same thing with your finger on the throtle. Just dont pull it as fast and its the same as punch control, only you control it.