Hi, @Jeff_F,
Yes, my team will be addressing this issue. We have been working on a solution to ensure that instructors are aware that they are leaving their comments in a draft format when moving from one student to another in SpeedGrader without first submitting their comment.
We plan to have this solution in place with our beta release this month and in production with the January production release. You can watch our release notes for more information on this added functionality, but to provide some advance notice of what to expect, we will show a modal when the instructor moves to the next student without submitting their comment. As you mentioned, we need to make this message much more noticeable to ensure that instructors are not just missing the notification. Instructors will have the option to proceed without submitting should that be what they planned to do or they can submit their comment.
We also have some additional enhancements planned for providing and viewing feedback. With that work, we plan to adjust the way in which drafts are presented to make it more obvious to a user that their comments are still in draft form as well.