link directory...can someone make this?

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I'm afraid that you can't do that with the nature of newthread and how the post will be processed by MyBB. It needs the forum id, which is already supplied by the URL.

If what you want is your users can create new thread directly from the main category without having to enter the subforum first, alternatively you can create a drop down menu in the main category template manually. Each item inside the drop down menu is linked to new thread page of each subforum.

Or, create the new thread link inside the (template_prefix_)forumbit_depth2_forum template, so it will be displayed in each subforum. You can use {$forum['fid']} to get the forum id.