@synaptic
BuddyPress Registration Options is similar to this idea but it only allows a user to fill out their profile and upload an avatar until the admin approves their account. It doesn’t allow posting to the activity stream however. IMHO if a user doesn’t take the time to fill out their profile then it is a good indicator that they are a spammer but I can see the value in your idea and would I would like to see this functionality in a plugin.
https://wordpress.org/plugins/bp-registration-options/
