Forum Grader Sorting by date option

As our professors are focusing in on grading in the new forum grader we are noticing that forum posts are sorted from Newest to Oldest. Our forum model requires an initial post with several follow up posts and we think that the ability to adjust the sorting option from Oldest to Newest. 

To replicate:

1. Create a new single simple forum
2. Add a simple direct grading method and a point value of 10. 
3. Save and display.
4. Using a test user make several different posts in the single simple forum.
5. Using a professor account navigate into the forum
6. Click grade users in the forum menu. 
7. Confirm that the posts are appearing from newest to oldest. 

Expected Behavior: 

We'd like the option to sort the posts from oldest to newest.