How about a carjack mode? There have already been a few that kill the engine after a predetermined period of time. The discontinued unit from the old Jacobs Electronics slowly degraded performance down to zero. The slickest is the set up DEI uses. It takes into account brake application and vehicle speed so as not to leave the car with no steering at high speed. I believe it's triggered by the first brake application after a preset time, then if the car isn't traveling too fast, bogs the car down to a dead stop. It'd be a big hit in Detroit.