i know this has been suggested 100000 times but it still hasnt been added yet and that's an issue
(groupchat)
The power groupchat would allow a host to hold a private group chat. The power is simple and I feel like it should have been added years ago.
The image below gives the options given once you have (groupchat). Anyone would be given permission to leave whenever. Also following you could add (nogc), or just have it be congruent with (nopc).