quattro list watson....

[Marco Weibel]

A disabled component to prevent starting/stealing a car sure is a good idea but it will not stop a burglar from getting at/in your car and make damage along the way.
A steeringwheel-to-pedal brace in bright color or clear external sign like Huw mentioned, a corner on a jack stand, preferably on the driver side that faces the street.
On my classic Audis i do the above including presenting a clean empty car, glovebox open. I do not lock the doors.

Happy Easter
 Marco