I would like to see a subject line added to the messaging system. I teach multiple courses with hundreds of students and it would be nice to "triage" messages. If I have 50 messages, I would like to deal with messages such as "can I have the password to ..." or "I need help with ..." first before dealing with "I have an issue with your marking". I feel this would allow students to move on quicker, and would allow teachers to assess student needs quicker.