add a "soft blacklist."
what this does is mark a post thumbnail red if it contains tags you've added to this blacklist, it is similar to how revealed posts thumbnails appear when you deactivate the blacklisted tags hiding them with the little collapsible menu that is on some kinds of pages. the color of the marked posts for this soft blacklist may need to be different. i think its a neat feature for some who dont mind seeing posts that would have otherwise been hidden with the normal blacklist, because as long as its marked it would do its job for the one using it. also, it might be good for casually looking out for mistags; for example if animal_humanoid is in use, it may mark posts containing anthros that were mistagged as animal humanoids.