As it is on the page were game results penalties are added the length of a penalty is restricted to 2,4,5,10 and a game misconduct is listed as a penalty. What would be more useful, and accurate would be if the length of a penalty was 2, 4, 5, 10, G as a GM is a consequence of a specific penalty.
i.e. 2 + 10 for Boarding, or 5 + G for Boarding.