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Sorry, English is not my mother tongue. May be that is
why I do not understand. When referring to scrolling I
assume a more or less smooth sliding of the viewing area.
If this is the case, then horizontal scrolling is definitively
bad usability. On the other side, I agree with Laisvunas,
vertical scrolling is not very convenient for book reading.
There is however, another possibility. I will call it
horizontal scroll jump, to differentiate it from the widely
used on the web called pagination.
What I mean is that it may possible to display two facing
pages that would fit in the existing viewer area and then
scroll jump (left or right) by two pages, pressing the
corresponding arrow keys on the key board. One could
even add some arrows that would appear on mouse
hovering over the right or left most zones of the viewing
area, to facilitate the scroll jump on touch screens.
I am not a programmer; I have no idea how difficult could
it be to implement, but that, I think, would improve a lot
the usability of the reader.
As I mentioned before, there is someone in the calibre
forum that did something similar for the calibre viewer.
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