I vote for banning signature and one question. What is the difference of a temporary signature ban to an amount of merit they should earn? I guess it is better option to let option 1 be in permanent only and let the temporary choice be on option 2.  Somehow option 2 is sounds a temporary signature ban too.

I'm open to suggestions.

By the way I vote for option 4 too. I guess there's no harm if we stick to the classic.