By horizontal scrolling (in page mode) I mean flipping pages like in a book, i.e., from right to left or vice versa or (in flow mode) have the flow go sideways and not down and up as the Calibre viewer presently does - e.g., the iBooks viewer operates by default only sideways, be that in page or in flow mode.
As for the mouse behaviour, by "choppy" I mean that the Calibre viewer appears to be at times unresponsive, i.e., when attempting to move through pages with page mode or within the flow with flow mode, I can move a little (either back or forth in the document) and then get stuck for a moment before I can continue. Maybe I have to tweak the mouse's behaviour, I don't know, I'll have to look into it, but I doubt that the mouse causes the problem. As I said, all my other applications and viewers work smoothly with the current mouse settings.
By the way, here is the operating system I am using with Calibre:
macOS Sierra 10.12.5
Thanks, Kovid!
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