There's a module for Drupal now that supports dynamic signatures - that is you store a signature and it gets added automatically to all posts and comments. When you change the stored signature it immediately shows up as changed on the whole site.

Right now signatures get added to comments when you write them so they become in effect part of each individual comment and so can't be retroactively updated.

They are different approaches - does anyone have any comments on which one they would prefer to have here at Comixpedia?