Some new users are put into "users awaiting approval" by the spam filters, but I am not sure they are spammers, so I would like to set their user permissions so that their posts are moderated. This way I can watch their posts and when I decide they are not a spammer, I can change them to a regular user.
I read your section on user group promotions, but am not sure how to use it for this purpose.
To make sure I understand - I create a new user group "New members being watched", set "Follow message moderation rules" to no, and manually add my possible spammers to that group. This will let me moderate their posts and when I decide they are not a spammer, I manually move them to the "Registered" group.
I don't want first posts for all users to be moderated, just those users that the spam filter catches and puts in the "Users Awaiting Approval" list.