When you set the main parent page permissions up the sub pages such as edit, add, detail, etc. and their sub pages all need to be done separately which is not familiar and can leave them public if not done, It might be the case they need to be separate (I haven't seen a real use yet) but a toggle on the parent to "Apply to Sub-Pages" would be great and save loads of time if they are all the same.
I see the extra option with the "Page restricted to logged in user by field?" might mean individual settings could be used per sub page but it would still be nice to apply the main access permissions to all then just adjust this field on the few pages with it.
Otherwise some kind of batch processing by checking a box for each page and applying permissions.