We just went through this... renaming the table is easy via south. The worst part is either ditching your historic south migrations, or rewriting them to be myu

We just went through this... renaming the table is easy via south. The worst part is either ditching your historic south migrations, or rewriting them to be myusers_user, since auth_user (in our case, and typically) wasn't south-managed, so it can't be 'unmanaged'. Remember to check you can recreate an bare database, or you'll be in for nasty surprises sometime later :)