(If this has been asked previously, I apologize - ran several searches based on "idle" and associated keywords, and came up dry)
...So, after playing for a couple hours, who suddenly finds they need to run to the bathroom? Get a sandwich, or beverage? Let a pet in/outside...? And then comes back to find a list of messages from someone who came up to your character, tried to interact, and didn't know you were afk? Or a bunch of /tells from friends who missed your [brb]?
Wouldn't it be nice to have something like an /idle function?
A little command to tie into your shortcuts - tap a key, your char is suddenly AFK. Possibly an /idlemessage ["...."] to auto-reply when you're off doing real-life stuff? Perhaps a small indicator in the char description ("User is Away/Idle" or for a more IC approach "[Name] does not seem to be paying attention to anything at the moment.") and/or an icon over the character (a little clock symbol? - I like the idea of an indicator, but this one might be obtrusive, especially in public areas).
To sum up:
-function to toggle "idle" status on/off
-ability to set idle message/autoresponse
-indicator in desc (IC or OOC?)
-visual indicator over character...?
Just something to tell the active players from those who said "BRB" ten, fifteen, or thirty minutes ago...