Steering lock is easy defeated by cutting the steering wheel and bending the steering wheel.I put a simple kill toggle switch in my Maxima, tapping the fuel pump fuse. Sometimes, if I was really worried, I'd pop the hood and unplug the MAF sensor too.
On a different but related note, I have been researching steering wheel locks. It seems The Club Twin Hooks 3000 gets 1st place in a lot of reviews. $21 (for yellow) on Ama and $14 on bay! Heck of a deal. I bought 2 tonight. Seller Pep Boys.