ya i love that as well. you can see when he corners just how hard he is pushing the car and then the F1 cars come around like they are in slow motion with no effort.
My wife's Benz has the stop/start feature, but it does come with a button where you can turn it off. Even though i doubt the GT500 would come with such a feature at least it is not something the tuners would have to do, since it is a simple toggle on/off.