In a current project, I have a page with a lot of invisible (= drafts / private) and only few visible subpages (= public). Visible subpages are sorted by the date the subpage was added (readonly date-field with today as default value). The latest public subpage should always be on top, so I added the setting sort: flip – but then sorting starts with the invisible subpages… It would be great if there would be the possibility to use sort: flipVisible or something similar, so that only the visible pages will be flipped when sorting, but the invisible ones stay at the bottom of the list 
It would probably be better to have some sort of filtering option, then we would not need additonal options in the blueprint, also see this post: