[speeder]

Yes, it's an effective anti-theft feature and I've had this experience very recently but it wasn't a car jacking. Someone broke into my car, found the spare key stupidly left in car and could not steal it because it's a manual. I wish I could tell you how hilarious the whole experience was but it's not. They cleaned out the car for valuables and have returned at least once to try again, (they have the key).