This addon will allow admins and moderators to view and move multiple threads from one forum to another. You will need to modify 2 scripts (menu.php and chooseforum.php) and upload them and the additional scripts contained in the attached zip file.
You can place a link to the script in the moderator menu area of the menu.php script located in your admin directory. The code needing to be added for moderators is almost the same as for the admin. I think I gave both examples in the test file?
I figured that since it moves threads and not individual posts there would be no reason to show threaded. But to do the showthreaded view it would be more involved as then it would basicly be postlist.php with some checkboxes allowing admins/moderators to move things.
I think I have it set at 50 per page display. Your going to change that to 5,000? sheesh! lol I forget howmany queries it uses but that's at least 5,000 queries shot at your server at once. It's up to you