Ability to edit "completed"

I would love to be able to have ability to mark/unmark the completed button with courses.

There has been times new users join in and submit their work to the discussion thread directly, but in order to get the check mark of completion it needs to be submitted through the course.

So if they could go and manually mark it off, or if it was marked off in error to be able to unmark it as completed.

Also being able to see the discussion thread directly from courses would make more sense and stream line the functionality