Survey Settings has a section (green) with some settings that relate to scoring
Omit NA is used to make answer options marked NA score as 0/0 instead of 0/X (X being possible points on the question).
Show scoring info on unscored questions is just a display option; you can choose to show 0/0 for questions that have no points at all and can never score.
Skip Unrequired is used when questions have conditional requirements, to make them score as 0/0 instead of 0/X.
Cap bonuses is used to keep job scores from going over 100% when there are bonus questions on the survey.