Is There A Way To Invert The List Of Posts? Newest First?

You can list the topic list itself in that order (if you're in the forum page looking at the list of threads) but not the thread itself, as far as I know. If you wanted to go to the last post in a thread, though, you can do that. In the list of threads, on the far right it will say who posted last in it, and the date and time. Click the little arrow there and it will take you to the most recent post.