I have some small suggestion that i know from some other MMO i used to play before xiv.

Lets say you go afk and someone messages you and didn't check if you have the afk icon or not.
It would be nice to have some sort of auto reply that you can decide yourself as in /afk "type some message you want people to know when they message you"

Example :
Your Friend: Hey what's up?
You: (Auto-reply) afk - back in a few minutes.


(Sorry for my bad english it's not my first language)