As it happens, new abusive threads are easier to deal with than abusive posts in existing well-mannered threads.
Regardless, the measures I have taken will severely limit the ability of new users to cause trouble in any form.
I'm doing some jiggery pokery behind the scenes in the way new joiners to NSC are handled.
To do this, I have to make some changes to the Usergroup that the existing 22,000 or so NSCers are in.
You may get a warning message about not having permissions to post/reply or, well, pretty much...