Fencer: Perhaps "never in this game" is a bit harsh, but maybe a "activate autopass until there is a possible move" would be a good idea.
In fact, that would solve ALL the problems, without having to agree on autopass when setting up the game: the player who cannot move could just click "do the autopass on my behalf until I can move again" if that's his wish. His opponent could not possibly object (could he?).