Special Avatar Sizes?

[nerofix]

It's possible, but not that simple to do.

You need edit the function_user.php .. and all templates with avatar info.

In first case ( < 1000 posts ) , you will use the thumbs in the custom avatar folder. In second case ( > 1000 posts), you have to use the original avatars.

In the templates you have to use if-else-conditions.

... but better don't ask me for exact steps, ask someone with developing skills ;-)