Hah, sadly no. And some enterprising thieves in the UK worked out that in certain model BMWs, you can cut a hole in the side glass and fit a sensor sender unit into the sender, while the alarm is activated. This is because the area beside the drivers mirror is an ultrasonic deadspot. Once the thieves have access to the diagnostic port, then can use the information to program a blank key to a valid key, and then steal the car.

The affected models were 1 series, I believe, and it started getting to the point where the chances of a high-spec 1 series getting stolen were very high. Google '1 series theft problem' for more info. There is a home-security cam of some theives stealing a 1 series in a couple of minutes using this technique.