The issue is more on adding users than removing them. Though if a user doesn't play well with others, it would be a good feature to be able to remove/report them (I know the latter is something that's in the works).
I've fiddled with PMs and can't seem to find any way to edit a permissions list. Which would require making an new private topic any time there's a new user that should be involved (e.g. adding a new user to an RP PM for OC/IC purposes).
And if it's desired that everyone have access to all the previous, private posts (e.g. a private IC thread that a new user should have a chance at catching up on), it would require archiving all the threads in hiders for every new thread.
I've fiddled with PMs and can't seem to find any way to edit a permissions list. Which would require making an new private topic any time there's a new user that should be involved (e.g. adding a new user to an RP PM for OC/IC purposes).
And if it's desired that everyone have access to all the previous, private posts (e.g. a private IC thread that a new user should have a chance at catching up on), it would require archiving all the threads in hiders for every new thread.