May not be entirely necessary but …..
Didn’t know if Gravatar incorporated it as a feature (not that I can see).
Is there any functionality inside AB ?? or would that be patch 317 ??? =]

No functionality for it that I’m aware of.
Not the most difficult thing in the world to add … but there might be a few more urgent fires I need to look at.

Signatures are by no means necessary, but they are a nice way to place links to things that you’ve done, so that other forumites can just find one post of yours in order to find any of the important things that you’ve created.