have you considered investing in a aftermarket alarm system? The factory set up isnt all that great, and im fairly certain getting around isnt that hard if you know what your doing. Just find a good installer and drop a good after market alarm system into the car, I think at the very least this will allert you the next time its atempted. You could also try and pull some McGuiver shit and find a way to secure/rig the ecu so it either cant be stolen or its so hard to steal they wont bother.