Aaron, pardon me if this isn't the right way to deal with this. I "just" created a MediaWiki site, and your extension has been the first one I've installed so far.
I noticed that after installing your extension, a "user talk" message is posted to the users that I confirm. It is along the lines of:
I've tried searching through MediaWiki, as well as various settings on my site and can't find out where this is coming from? I would like to change it to better reflect some of the duties, responsibilities, and suggested activities for new users.
Is this something your extension is doing? If so, how do I change it, if not, do you have any hints on how I might be able to find it?