It would also be helpful so that when other players see a player that @ooc, all parties acknowledge that it wasn't just to escape a situation.
Not sure if you guys would get what I mean...
For instance, there was a situation where I really needed to @ooc, but felt that others would think I was escaping or had bad sportsmanship. So I just afk'ed and faced the consequences.
In addition, when you really want to let someone know you are going to afk and be back in a moment, but could not (due to the circumstances such as being in a different room), this is very helpful.