Post-it'ed in my car. If I see anything in the western sydney(parra, ryde, merrylands, granville)area, will post here.
Guys, do what my uncle does. Pop your bonnet and remove a few engine relays. Its not probable that the thief will pop your bonnet and check your relays, and without them the car will not start.
Or if you're handy with a soldering iron, wire in a breaker wire and a switch. Or use a magnet responsive switch concealed under the dash and use a swipe magnet to activate a relay and close the circuit. Sooo many things you can do. You could even wire up your own keypad!