I use a couple of different avatars. My Meta Stallman Beard is great, but I don't want it all over my Arqade Miniature-giant-space-hamster. Can the default 'apply all' button only do so for sites with the same avatar?
This is a great idea, but Flyk is correct - it's probably too big of a feature and too late now to include it in this year's Winter Bash. I'll put it on the list of things to remember for next year.