We had RSS feeds coming in our staff section and wanted to move them to the public forum, but when we did, they didn't show up as new for anyone who had marked forums read after the date and time that the thread was originally generated. When we moved them to the public forums, nobody knew they were new threads. Now if we change the date and time to the current date and time when we move them, they show as new. I'm not sure if will work for your needs, but it's the only thing we found. Good luck!