I have used the Valet mode when the car was transported, works great.
The Valet Mode prevent from WOT (wide open throttle) operation is
prevented by making the engine 'cut out' if the accelerator pedal is pressed past half-way.
I've used Thomas Sunday to ship cars. If Kevin MacKay at Corvete Restorers trusts them to ship cars valued at a million dollars, then they are good enough for me. http://www.sundayautotransport.com/
As mentioned before, a valet chip would work but I have it burned with a 15 mph and 2500 rpm cut offs.