This addon is GREAT, everything I could imagine.. and more!!! Got it running on my vB3.6.0 site and it's working great.
One question, and I'm sure it's a silly one, but I just want to be sure... when you set the usergroup permissions, I assume the options of 'edit sites' and 'delete sites' options only apply to sites that that user has added?
A suggestion for an addition, to let the number of sites each user is allowed to add to be based on usergroup, rather than a global setting for all.
Anyway, great hack, looking forward to any and all updates you make