If you have a NRG QR, they have locks now that you can put over the QR hub after you remove the steering wheel.
http://www.nrginnovations.com/nrgquicklock.php
So, now you don't have to worry about someone like Andrew coming around with his steering wheel and jacking your ride, haha j/k man.
There are some other companies that make QR locks too, can't remember off the top of my head. I think Prodrive is one.