I would like the grade book to have a status "Incomplete" in addition to none, late and missing. It would be very helpful for students to just see that color status and go back to the assignment and complete it. So far, I have been marking it as missing, giving students half credit for it, and they always write back saying they completed the assignment. An "Incomplete" will do it, and no one will write to teachers because they'll know what to do.
Thanks for considering it!