Sounds like a good idea, and should be great in your Beetle.
But just a warning to other who might be keen to try this out, if your car isnt EFI then this is a very bad idea, keying off will cut the ignition but leaving it in gear the engine will still suck in fuel from a carby (or mechanical injectors?) so when you turn the ignition back on you have a lot of unburnt fuel through the car and get get a large explosion, this can destroy intakes or mufflers and makes a frighteningly loud bang.
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