I've attached a patch containing a fix to anonymous posting - it now uses the token.
Also added pre and post addition hooks.
sfCommentActions:addComment:pre - passes the commment values and the object the comment it to be added to.
sfCommentActions:addComment:pre - passes the comment object and the object the comment has been added to.
I'd like it for a plugin I'm working on sfPropelApprovableBehaviorPlugin which will allow moderation of comments (and anything else) but it requires a way to hook into the action being performed. Sometimes this can be done by overriding the actions, but in this case you can't because it redirects after posting the comment.