Over the past 25 years of online gaming I have played several MMOs that had an AFK toggle button you could hit so anyone messaging you would get a reply letting them know you are not there. I was thinking since there are so many AFK activities in the game a way to have all whispers/messages give a reply would be a nice feature.

Something simple like toggle afk and put in a short message "gone fishing" or "back in an hour" type messages

Another good use for it could be for nodewar/conquest, same toggle AFK, with a message that says "at war, can't talk"