I saw John Dilger's 1971 911S racecar do that very thing as he was warming up the car in the paddock to go out on track. He was not even in the car- getting his race gear on. My Dad and I were worried it would run away to redline. 
Perhaps there will be some more ideas on the Early 911S Registry? Mark Jung has already replied here, though.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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