I think we can support rooms under the standard permission model:
- Can View: View permission allows you to find the room in a browse view and read the room contents.
- Can Join: Join permission allows you to write messages.
- Can Edit: Edit permission is like "moderator/admin" and allows you to retitle the room, change permissions, etc.
For private threads (those missing the room flag in T7583), these should all be locked to "members of thread". For rooms, they should have reasonable defaults and be editable in the UI.
- From the column, Dropdown → Edit Room or similar.
- For Conpherence Full, we can change the last crumb to be a dropdown
We should also figure out how to show room policies to users, since we don't have convenient subheaders like we do for other objects.