All sounds good/not sure anything else missing.
I was able to fix this on the Lite over course of an hour or so, so the Create Thread stuff works now. Seems you had portions there but not the full code. So added the button, put it to use and found the new thread form pop up in the bottom as it should but the redactor was missing the whole form part so all that was there is the title and category. Fixed that as well. Working good.
So will wait for the next patch/update