It would be useful if in All Pages one could select a contiguous group of pages by selecting the first one, pressing and holding the Shift key and then selecting the last one in the group and by doing this all the in-between pages would be selected too. In this way if say, I want to delete a group of pages I would do it much more easily than having to select each one of them.
Voted. Another luxury would be to invert the current selection. Currently can only Select All and then deselect the minority.