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"ICON_JPG" just specifies which icon is showed for books of that type within the library and "last opened" list on older firmware versions. For example, on my old 902, the icon is a little image of a page with "JPG" over top of it. It seems to be ignored in newer versions of the UI. It has nothing to do with the thumbnail images associated with ebooks.
I don't know of any way getting the library app to use the first image as the thumbnail. I think that the program that scans the books on the reader just has no support for zip/rar archives. It doesn't know how to handle them.
I am aware of the problem with the "go to page" keyboard, but I don't know how to fix it. New native applications don't seem to use that keyboard dialog anymore. However, I don't see a replacement for it within the SDK, so I don't know how to call up the new paging interface. The best thing I can suggest is that you use the Table of Contents (called up with the Menu button) to go to other pages. I'll take another look at the SDK to see if I can figure out which function call brings up the menu with the page selector in it.
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