Automated reference checker
Whenever a student is creating a post, whether a question or response, it would be beneficial for the student to be able to select the reference style they are using (e.g., APA 6th Ed.) and have the system (1) provide guidelines on how to make a proper reference, (2) automatically check the reference for correctness, and (3) provide feedback on what was incorrect in the reference.
Kind of like this one – http://jonathanaquino.com/apacheck/
This is something that is fairly easy to implement but has a tremendous value as it is so difficult for many to learn and get used to referencing the sources properly. If the students are forced to go through this experience every time they post something, they will learn it quickly.