I'd like to make it so that the alarm will go off if someone tries to jack up the car, tow it, or smashes a window. I really hate aftermarket alarm systems though, as they are generally either crap, or require a ton of wiring and alot of time to install (or they are both). I was thinking about adding a sensor to the factory alarm, maybe making it so that it works through one of the door trigger wires. Before I try reinventing the wheel is there anyone else who's done this already?