BuddyPress.org

You might want to join this group for part of what you’ve requested (the admin resend of activation emails/activating manually): https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/over-1000-not-activated-users-what-do-you-suggest-we-do-with-them/

Seems like he could add the redirect to the plugin as well. I don’t think it would be too hard.