A function where you can enlargen the miniatures in the miniature view mode would be handy. That way it is easier to find the correct page which you are looking for.

Perhaps through a preview mode for the individual pages, or better: a setting to see the pages in different patterns e.g. 3 pages next to each other, 2 pages next to each other or single page.

This would come especially handy for flashcards as well, as those are very hard to organise in the miniature mode.