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One thing that would annoy me though is if my opponent spends 5 days per move and makes 10 moves before I get a chance, thereby leaving me hanging for a couple of months. Perhaps a time limit would be appropriate after which the auto move turns off until I make one more move. I think it's most effective as a way of playing a whole bunch of moves on one day.
Heck, grenv, if yr opponent takes 5 days to make a move, you are going to get annoyed anyway, whether you autopass or not. And probably you are losing anyway, so where's the rush?
I still favour an option.