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Swiping is complicated, and even more so if you change the reading direction from right-to-left. Usually, swiping pans the image (i.e. it drags it along with your finger). If the image cannot be moved along the axis of the finger movement, then the swipe is interpreted as a Next or Prev button push. The interpretation is based on occidental book layouts (i.e. swiping right-to-left turns to the next page, and left-to-right to the previous page). I suppose that I should change that interpretation when the right-to-left reading direction is selected. However, that doesn't help with your situation where the pages are very wide and the image will be panned.
PocketBook reader software uses tap zones rather than swiping for page turning. pbimageviewer tries to emulate the same behaviour for the tap zones. So, I suggest that you familiarize yourself with the tap zones on the device, and use those for turning pages. Use swiping only when you want to pan the image across the screen.
For reading a two-page manga layout, select "Fit height in portrait, fit width in landscape" as the zoom mode, and then tap near the middle edge of the screen to step forward, and tap near the bottom corner of the screen to step backward. The reading direction controls how the stepping across the two pages is done.
The -dbg version is the debug version of the application, and contains debugging information that allows it to be run using the gdb debugger software. It is meant for developers who are trying to track down bugs. It doesn't offer any useful features other than that.
I'll think about adding the thumbnail feature, but probably won't if it is a lot of work to implement. I still think it would be best accomplished using different software, but I acknowledge that it is unlikely that that software will ever be written.
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