I'm happy to see this functionality being considered for Moodle Core.
After reading through the spec, I have a couple of questions/comments:
- When an Advanced Grading option is being used, can it display in the Grading pane, or does it have to pop up in a way that obscures the Submission pane?
- Would the forum grading method have a filter to show only posts by a specific student?
- Can this interface support multiple graders, and especially peer graders? See e.g. MDL-31237
- How would this interact with sites using TurnItIn or similar? Can this display TurnItIn assignments? Could it help in allowing Advanced Grading (e.g. a rubric) with those assignments?