link directory...can someone make this?

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It doesn't give any moderation privilege to the users. Basically, it is the same as the users choose in which forum they want to post it.
The thread will be moved after it is created by MyBB. It means that it already passed all validation and permission checking in the original forum (forum linked to the newthread link). It also will be applied for forum(s) in the $xtld_fids setting only (original and destination forums).