This issue came up during the beta testing of RCS, but neither Martin nor Andy were able to reproduce.
With RCS64 up and running on your box (no matter if in racing or just in one of the setting page), car on the track and controller plugged in the power base, the car will start moving as soon as you press the trigger on the controller.
Now physically unplug the controller from the power: the car will start running at full speed!
Has anyone else seen this happening on their set up? It might be related to some settings that I have configured on the power base through the tower?