Comment by palmotea

> We're going to add that. I've resisted adding reasons-for-flagging for years, but even I can change my mind every decade or so.

You need a reason that means "this person is talking about something helpful that an admin needs to fix." Flagging currently has a negative connotation (too many flags and the comment gets deleted), but sometimes you want to flag a comment that says something like "the link is broken and should be X" to just bring it to admin attention without the implied negative judgement.