In general, I think it'd be best if all the avatars were selectable from the Change Avatar user settings function on PS, but considering the sheer number of new avatars that would have to include relative to the 293 in there now, perhaps it would be better to just have the Change Avatar function link users directly to the avatar page and offer a brief explanation on how to change avatars with /avatar [avatar name].
On a separate note, a way to sort the avatar list by the generation each avatar originates from in the same way the PS list has it currently would also be nice, imo.