Thanks for this much-needed plugin -- it's working great. I am a bit confused about why the plugin doesn't seem to install a menu in the Network Admin dashboard (http://site/wp-admin/network). Am I missing it somehow? I've looked everywhere.
I did see that it puts a menu on the Dashboard of every child site, but it doesn't seem to allow logged-in network admins to add any user on the network to the current site -- only users from sites for which the network admin is a (site) admin.
Hope that's clear. What I'm trying to do is add all the previously-created users on the entire network to one particular site on the network.