Very often when we mark their work, many students will go straight to the grade on their assignment and ignore or at least fail to process any written feedback. As markers we put a lot of time into this task and nothing irks us more than seeing this effort wasted.
To encourage students to engage with our feedback, I'm sure many of us would love to see some kind of adaptive release of grades. The idea is this: to have their grade automatically released, students would first be required to use our written feedback to write a paragraph or so on how they intend to use the feedback to improve their performance.
There is an excellent article about this here but currently no such feature in Moodle as far as I can see. I know there are 'conditional activities' for quizzes but it would be great to see this kind of thing applied to grades.