It would be nice to have the ability to create Q&A nodes/forums similar to Ask.Ubuntu or to what IPB has. Where users can ask questions as well as reply with answer and you'll be able to upvote/down the answer as well as mark "best answer" when the issue has been solved. This would also be helpful here on the official Xenforo forums when you're looking for support. If you use the search function and find someone else who already made a thread (question) with the same problem as you, you can quick and easy find the "best answer", especially if the thread had gotten several pages long. Possibly an option to sort answers after either post date or most upvotes.