How about this for an idea.

Lets say a game is sent to you where you have to pass, have a prompt that says "Do you want to continue to pass until you can make a move?" yes/no

If you choose yes - it will continue to pass until you have a move to make. If you say no, the game will come back to you the next move.

If the player says yes, then have a small note go along with the game to the opponent which says "Your opponent choose to automatically pass his moves until he has a move to make. So any messages you write them may not be read until they have a move to make." That way the opponent knows the message isn't being read AND it gives each user the CHOICE to use or not use autopass.