Posting in categories or on the forums without a forum

Hi there.

So I thought it'd be possible, but it appears like it's not.
I want to be able to post threads on the very front of the forums in categories:
As you can see in the image, there HAS to be a forum in the category for the thread to sit in, I don't want that for the rules. It seems pointless having a forum for 1-2 threads.

Thanks ^.^