Re: Ability to “save draft”
Drafts are for blogging systems.
I can’t imagine why a forum would need drafts.
However admin have the ability to edit deleted posts so you could create and delete a topic and then edit the post – then undelete it.
bbPress won’t show topics/posts that don’t have a status of zero so if you wrote a plugin for drafts you could just create topics/posts with a special status of like “7” until it was published.