Or maybe a vertical slide-button (that returns to the centre, but can be moved up or down for going backwards or forwards in page-numbers respectively)... used only for moving multiple pages at a time... therefore probably working so that the longer you hold it up or down, the faster the pages turn.... though with eInk, the pages wouldn't actually be displayed until you "land on a page", so only page numbers at the centre of the screen would need to be refreshed.
- Ahi
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