see multiple - previous, next and/or out of sync - pages at once or a quick view between them
a feature that allows selection of a random, or multiple random, pages to view on the same screen or view with a quick action while reading.
much like when physically reading a technical publication that refers ahead or behind to photos or diagrams, you'll start to hold the page(s) with maybe a finger or two so you can quickly switch back and forth.
it would be nice to select a certain random page or maybe 2-3 to show on screen while reading your current page.
another option would be the ability to select 1 or multiple pages to view then a layered icon appears that allows you to select a layer (a page) and view the page then quickly return to your current place.