This topic will continue to be important as many faculty do not fill in grades consistently throughout the term and students are surprised when they fail the class. We've played around with checking and unchecking the "Aggregate only empty grades" and have our system set to checked (ignore). Overall this proved to be the better choice, but only if faculty enter in zeros. MoodleRooms clients have access to the Joule Grader which makes it much easier entering in a "0" for all assignments/students, but the onus still falls with faculty. Having this process automated based on past due date would be great!
The data points to how important it is for students to know what their grade is and even may correlate to completion.