Lack of a report user button.
 

I see we can only report posts but not users. We seriously need a report button user button.

It doesn't matter, because we (meaning, the mods) do have an option when we delete spam posts to also ban the user who created those posts. And we do use it, or at least I do. Any time I get a spam report, I ban the user who created it, because I know it's a spambot.