I've seen a lot of afk suggestions, mostly about people messaging and not going through because they're afk, and they want it to transfer through to a /mail, I've thought of a different thing, but I'm not sure on the benefits of it.
Basically, if a player has gone afk it will have an 'A' next to their name in tab, now that I think of it it sounds pretty dumb, but it will also make people who message the said afk person aware that they are afk and can message them once they become un-afk or they can mail them if they go offline before the have the chance, and also on their /seen there could be a 'Status:' type of thing that will show if they're Afk, online or offline, but that could also tie in with the current /seen of a time if they're offline or online. so I'm not sure, but I've thought of it, but I'm not sure how easy it will be to chance the current viewings of tab or /seen, but owell.