When you complete a checklist, there is a difference between points that you perform and points that you pass by but are not applicable at that time. Now you can only tick off points. You don't want to leave points open. But afterwards, you want to be able to see the distinction between something that was executed or something that did not apply. So it would be useful to be able to specify an 'nvt' (not applicable) option in addition to the checkbox, so that the entire list can be completed without leaving points open but still seeing the distinction.