are we ever going to be able to delete our own posts/threads?
No. There's too many problems with that. It says in our terms and conditions when you sign up that we only remove content at our discretion so anyone signing up should be aware that posts are here to stay
People ask us all the time - "I want to leave the site, delete all my posts please" - not only does that delete their posts, which can mess up existing threads but if they posted their own threads then it would be deleting other peoples posts.