We're all aware of the big red steering wheel locks out there. Designed to lock your steering wheel and prevent theft. I am guilty of running one on my old Jeep. Even though I do know that they're easy to defeat and only deter opportunistic theft.
With the TJ, I went to a RFID based secondary starting system. Not Sentry Key, but my own home build system. I'll cover it in a future post.
The would be thief can't put the seat back, and if you can't sit in the drivers seat, you really can't drive away.