It would be nice to have the ability to disable avatars on a per-person basis.
Amoung other things, it solves alot of the problems that the idea in the "
NSFW Avatars" thread was aimed at: being able to see most avatars at work. The onus would be on the person browsing the boards, not on the person with the avatar, which makes it quite different.
It would also allow someone to block out avatars they don't visually like.
I could do it manually using a web proxy or by hacking my client, I'll admit.