To add some context to why we want to update the current commenting system. Moodlerooms is looking to do a lot of open source work this year. We have a specification for changes to outcomes, commenting and we are discussing the release of what we called Joule grader (to be renamed to something more appropriate) to Moodle HQ. If you take a look at Joule grader on youtube this is our concept of a cohesive location for activity grading and comments. This along with the proposed addition of a message output event for comments IMO provides a student and teacher with a reduction in the feedback overload that your looking for.