Hello again (haha),
I would like to suggest the ability to make grade posting dates for terms (marking period (US)), in which teachers are allowed to edit the mark book during the specified term. After the date passes, grades are locked in for reports to go home with students.
There is a system in Reports for this exact purpose, called Manage Access, which allows setting date ranges and cutoffs for different roles in the system. I’ll point you to the following post, which explains how grades in Reports are intended for formaized reporting whereas Markbook is a teacher’s live workspace for recording grades and isn’t locked: https://ask.gibbonedu.org/discussion/comment/9542/#Comment_9542