I wonder the same thing. G-mail doesn't seem to transfer over. Maybe it has to be a clint/server? type or something. Or maybe the e-mail account has to be setup through the e-mail program on the phone, not thel stand alone g-mail reader or something like that. Let us know if you get it working.
Let's pretend you throttle 100% and it gets a "reading that doesn't make since" so it holds that reading until it can reset. That sounds like the whole Prius issue all over again.
It would make more since to drop throttle to 0% until a reset can accure.
I have a galaxy 3s and mine pauses music and reads the message out to me automaticly. Just go into massage setting (on the radio) and change it to auto read and display message "full screen". Should work fine.