Hey Jack, thanks for all the info. I'll see what I can do about breaking one :-).
One additional thing that's been talked about in regard to these is that supposedly the ECU can control the locking action you describe above but so far nobody has found the control in the code. Even if they do I'm not sure what they plan to do with it besides maybe make a special mode that disables AWD for dyno and drift purposes.
You know me, I'd like a little more. In your fooling around if you see an obvious way to create a 3-way switch so that a person could choose RWD, stock, or locked that might be a popular thing...not sure if there'd be a way to sell it, though. I know I'd love to be able to just lock the thing at the dragstrip.