To not waste time having to scroll past pages of sidetracked perpetual disagreement by the same usual suspects, I'd like to be able to ignore them and hide their posts from view.
I feel addressing them with a request to stop it would only fuel a fire. Better let it bleed to death. (Better still would be if they continue their fued in PMs)
While moderation is (still) light for understandable reasons, an ignore button would be a nice stopgap.