Do you use grade book columns that are not associated with content in your Learn course? If so, what situations do these apply to? What do you track in these manual columns? How do students become aware of these graded items and their associated grade and feedback?
Yes, we have a column that can trigger a completion as an instructor override, and the instructor manually enters a value. There are a handful of situations where this is useful, none of which is the student "getting away with it."