This ones a good suggestion. Though, instead of making it automatically sorted, there could be a button instead that you can click, usually above the threads that will sort the threads according to probably title, creation, or last replied, depends on what you click.
I understand what you mean, but it's kinda out of our hands as this is what the creator of the Forum Engine has set in place. We are only using their engine as a template for the Forum and it is not our own coding.