Maybe invest in one of these


Or one of these to hook to another car


or wire something like this up to your false ignition switch



get a detachable steering wheel hub


or take 5 for extra security


get an extra set of locks





but seriously. if you live in an open neighborhood, and cannot park in a garage, and your car is worth anything to you, you will do any number of these things. Also consider purchasing a car cover. it will keep your car in good condition, and keep prying eyes out.