I don't have time to try it right now, but what I was thinking was just to set "Can Post Threads" to No like i mentioned, then find (in the user manager) the user you want to grant permission to and choose "Edit Forum Permissions (Access Mask)" from the Quick User Links dropdown, and select "Yes" next to the forum where you want that user to be able to create threads. I really don't know if it will work or not. If it doesn't, then you may be stuck with usergroups or else writing a custom plugin.
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