It's probably too much trouble to go through and there wouldn't be much gain for Frihost in my opinion.
If it doesn't happen, I'm sure you're always open to changing your avatar yourself. I've seen a lot of members to something similar. I seen Max had an avatar like that a few days ago. I also see people putting little messages in their signature.
Some have even written blogs about them getting ready to be away for a while.
But it's a good idea, I just don't see it happening.
It could technically be done, but I'm half half here. The idea seems good, though. Also, some just put it in their signature. So, it's a good idea just I'm not 100% convinced yet.
You could also use the location in the profile... which most people wouldn't notice probably...
The only use I could think of this, is if you can't post anything for a large amount of time, so points would decrease slower, so you don't automatically lose you account. If you don't understand what I am saying, It basically means "If your computer broke, you should go onto another person's and say you will be gone for a while, so points won't decrease as fast so you don't lose your account."