ACF form can be used to create a new anything, but it requires creating an acf/pre_save_post filter to do the work.
For example, say that you want to create a new category for post you could create your call acf_form() with array('post_id' => 'new_category') then in the pre_save_post filter
if ($post_id != 'new_catetory') {
return $post_id;
}
// code for creating the new category
// including setting $post_id to "term_{$new_category_id}"
ACf could be used to do what you want, but it will take quite a bit of coding to accomplish in order to get all the details right. Honestly, I think that your best hope of getting something like this is the BBPress community, or hoping that BBPress adds something like this. What you’re looking for looks like a lot of work, even with ACF to help you with the forms you need.
