You know how you can listen to the radio (and use the bluetooth hands free system?) when parked with the car turned off by just pressing the start button without pushing on the brake? I assume this uses a lot less battery and the engine won't keep coming on as you sit there.

My question is.. is there any way to put the car in this state after driving without turning it completely off? With normal cars you can park your car and turn the ignition one click between turning the engine on and taking the key out..