I can see why Tesla limited the speed to only 70mph, so that if they pick up the car they can drive at freeway speeds. I personally wouldn't set valet mode if Tesla picked my car up. This is a good reason to have the speed limit adjustable in valet mode. Maybe even have multiple settings as are available for driver profiles. I would then create a few profiles, Valet-Tesla, Valet-Parking, and Family Test Drive