<Snipped quote by LegendBegins> Hold the phone! People try to abuse systems? No way! Actually, I thought that's what moderators were for. And ban lists. And rules like "be Fonz cool." Don't overthink it.Sarcasm noted. However, the point is that it's much easier to maintain a whitelist than it is a blacklist.
LegendBegins is a Moderator. They assist users and keep the forum running smoothly. They have power across all forums.
Though if it's too hacky to get that to work, I may just add a small input box to the editor that auto-suggests usernames and then lets you click some "Insert @Mention" button to place it into the post you're writing.
Note to self: Currently @Mention and @QuoteMention notifications are only registered/sent upon post creation, not when editing a post.