gosh.. for all the time and money to implement, defend, replace, insure your precious car contents... what about methods for just preventing entry in the first place? what about a few layers of security laminates that keeps your glass together upon impact? (i know the glass still breaks, but it's ingress you're trying to prevent). What about hidden deadbolts either manually or electronically operated to prevent the doors from opening even if the factory locks are disengaged?...
and then if we were hell bent on assaulting the intruder's well-being, what about strobe lights? granted they don't do much in case of a daytime break-in... but i think the majority would be under cover of darkness... if your eyes are trying to adjust to daylight and blackness every 2 seconds, you're not going to make much progress.
here's another thought... we're all supposedly into the carPC idea. your computer is a wonderful tool for automation. Why not when the entry alarm (not shock sensor) is triggered have it dial out to 911 (cell phone or otherwise) and play a recorded audio file reporting a burglary in process followed by a text-to-speech rendition of your gps coordinates or street intersections?
dabbling down those roads i think might avoid the lawsuits and they're just more ideas to improve security or response.
just my $.02, fire at will.