Anonymous discussions have been recently implemented, and that is great!  However, grading is not allowed for these discussions, even grading based on completion.  Why not allow the instructor to assign grades to each discussion post, without knowing who posted?  This would also be easy to implement.  Also, based on the comment below, an option for "anonymous to peers, but graded and hence not anonymous to instructor" option for Discussions would be great.

Benefit:  Instructors can create *required* anonymous discussions. This motivates students to post, on schedule, with effort, and yet protects them from feeling judged *by peers* for wrong answers.