Has anyone considered modifying the registration system so that users
who register under a subsite are only associated with that subsite?
To do this, would it be as simple as adding a package_id column to the
users table, and for the main site, either using its package_id or
leaving it as null?
I think I remember reading that the main site is actually just a
subsite, but alas, I couldn't find the place in the documentation that
said that -- is this correct?