Hi: The issue of spam has gotten us into trouble and so we are looking to add "New Registration Moderation" plugin for our site running WordPress MU (latest version) and Buddypress (latest version).
The idea is very simply:
(1) anyone can register, including upload their avatar just as it is right now.
(2) Their registration will remain in a place where only Admin can see, after receiving an alert.
(3) Admin clicks a button to authorize the legitimate registrants and may send the IP address of unwanted into a pool of BAN.
We saw a few plugins that sought to address that, including a buddypress version (http://webdevstudios.com/support/wordpress-plugins/buddypress-registration-options/), but all of them are old, substandard and not working.
We'd like to pay for your development time, if your cost is reasonable. Would you please help? I can be reached at firstname.lastname@example.org