I am running Buddypress multi-sites. Unfortunately BuddyPress Registration Options only allows super admin the rights to administer approval of users in a multi-site environment.
I have many BP sites in a SaaS environment (Multi-sites) and only the super admin can approve or reject users.
Administrators of other sites within the multi-sites environment does not have any rights to approve or reject users and is the case outlined in http://wordpress.org/support/topic/not-working-with-bp-installed-on-site-other-than-root?replies=6.
Both problems are the same because bp registration options only allows root to administer users.
I hope you can look at fixing this issue