I bet you owners of newer BMW cars with that start/stop engine button did not know you could run your car without the key in ignition lock. Apparently if you had your engine running and when you turn it off, remove the key from ignition lock you then have 15 seconds to push start engine button and drive away without your keys.
Some say it is anti hijacking feature some say it is BMW new comfort access option. Hmm, I guess if hijackers got your keys and you are still sitting in your seat you can drive away… that is of course if you are still conscious and without gun pointing at your head. But by all means though if your life is in danger don’t try to be a superman and drive away from gunpoint. Your car is most likely insured, but scientists yet to discover way to resurrect people from death.