So, over the past few years I've been on this website, I've noticed that on occasions chat mods would be on idle while a new user will be active in the chat spamming or unknowingly breaking the rules. I think if people could "ping" moderators or other users to get their attention by using the @ symbol + username, similarly to Discord, it'll send a notification to that user if idle. I believe this would be an efficient way to reach out to staff and/or friends when needed.
If this or a similar concept does get implemented, I think it would be handy if @ + Username would also link to that users profile.