I agree here, the "2 per tube rule" was never a rule.
Only the people who wanted to be courteous, were.
I don't think it should become a rule, either.
Because if we're going to make common courtesy rules, then I want a rule that states whoever is the first zombie, must !ztele out of the cade as a common courtesy.
That's the only thing I can think of at this time that I feel passionate about.