Now that we just got a fresh batch of new site assistants, I started to think how nice it would be if tag additions made by assistants/mods/admins would be somehow indicated directly in the tag editor (thicker borders or alternate colors, for example) so you can quickly see if the tag you’re about to remove perhaps should not be removed, without having to consult the tag history.
I don’t know how many people would care about those indicators, but at least the site tries to warn them.