I have a set of sliders that need a two checkboxes: the default “Not applicable” option, and a “Don’t know” option. I have turned on the ‘add “not applicable” option’ feature, but it only allows for one “not applicable” column. To be clear, I really need both of these, and it would be ideal to have them both at the end of the slider the way the default “not applicable” option is.

How difficult would it be to implement this?