Remove numbering from certain index cards?

In corkboard mode, I’d like to use occasional index cards for dividers, etc. as visual cues, and not have them included in the numbering system. Is it possible to have only the actual scenes numbered but other cards unnumbered?

I don’t think there is any way to pick and choose like that. The card numbering is just on or off.

Index cards that don’t have synopses can be made to appear “ghosted”, but this only works if numbering is switched off.