"It would certainly be great to be able to have addresses created automatically when the user registers."
Agreed. And we should be able to assign an email address to a tracker item. We can do in other parts of Tiki: https://doc.tiki.org/Mail-in
A challenge is that Tiki can't create mail accounts. We need this for other use cases such as http://wikisuite.org/item22-Mailing-lists-without-Mailman-using-only-Tiki-and-ClearOS-groups
FYI, we have big plans to make email automation awesome in WikiSuite.