Ditto. That really frosts my pumpkin. Before I finally said pisonit and sent it back, I considered leaving it plugged in only for the regular drives, then unplugging it when I was about to do some maneuvering, like in the supermarket parking lot I mentioned.
OBDII splitters are a couple bucks if you don't mind slow boat shipping. At least Progressive's device only reads the VIN when it's been off power and gets plugged back in.
The above bits of trivia are provided only in case they're ever standing between you and Final Jeopardy.