Pythagoras: Doubling when on the bar is not 99.98% stupid. There are plenty times when I pull way ahead of someone, bear most of my pieces off, and then get hit. In those situations, it often makes sense to double, as I will probably still be ahead when I get off the bar, but not so far ahead that I will get the gammon I was likely shooting for before I got hit. Moreover, people will often take HORRENDOUS doubles in situations like this. So auto-pass in a cube game makes no sense at all. But if it were available as an option, I would have no objection (who would?). I would just have it turned off.