Hey @jonmoore – You’re right, I was only able to add the custom columns with the Pro version of Admin Columns. It required a little custom code to make the correct calls to the database, but it wasn’t too difficult. Let me know if you can’t figure it out.
If I’m understanding your question correctly, I was able to accomplish this with the Admin Columns Pro plugin (see screenshot below – in my case BP groups are called “Committees”). It is a paid plugin, but they provide a great starter-kit template to create your own columns with custom code.
I was trying to achieve the same thing, but with users created in the admin backend. Took me a while to figure out that bp_core_activated_user doesn’t fire on admin user creation. In case anybody’s looking, the user_register hook worked for me instead.