Moderator View Watchlist

It would be fantastic to have a feature like a watchlist in moderator view, that essentially gives users a role or icon that only staff can see. 

Then having the ability to comment on why the user was added to the watchlist, who added them to the watchlist, etc. Very very useful community feature that I have to find a hacky workaround to make in every server I've managed. But to see when a user is on the watchlist on the message they send would be so unbelievably useful.