Hmm. I know you have to press the brake to start up the car with the 8 speed, so maybe a brake lock would work?
http://www.amazon.com/The-Club-Vehic.../dp/B000L9T7AY
I know it's kinda tacky to have a physical lock (just like those old school wheel locks) but this might be the best solution.
I've never had this product before, but this news scares me enough to want to try...