I read here or elsewhere that for the Accord Navi system, you can get into diagnostic mode by pressing menu-map-cancel together for 5 seconds, and that gives you round one of some interesting screens... Then if you hold menu for another 5 seconds, that gets you into developer mode. I was thinking along these lines, that somewhere in the hidden modes of the Navi system, there maybe was a toggle for restart on shifting into Park.

Maybe I am dreaming!

FYI, it seems like there are a lot of cool things you can do in these modes, but there is always the chance of messing something up. But as a lifesaver, you can always apparently disconnect the battery, and everything goes back to default.