[dcb]

I do like the "disable the car after they pull out" approach on some levels, the perp would definately not want to stay with the car at that point, though they may be more comfortable with experimenting with the car parked.

Also switches can be hidden in plain sight. I had an el-camino that the blower fan didn't work in a certain position, so I set it up to be the engine kill position. Any of the myriad of buttons on cars (or combination of buttons) with a simple processor can be used to enable/disable other systems in the car.