For now I only know of the two add on readers for Kobos and Kindles. Sergey's port of the Coolreader program is part of his PBChess download which includes some of the USB functionality as well as other games and utilities. The Kobo Start Menu can launch that as well as Koreader. Coolreader is not as much for PDFs.
I personally don't use Nickel anymore for reading, but as I said before there are others who still use both. Starting Koreader with Advboot or the Kobo Start Menu means that all the background database processing and phone home Kobo process, of Nickel, are not started or running while you use Koreader.
I most often do the "Switch Zoom mode" first, with PDFs, and "Zoom to fit content" often has the effect I want. When I have used the crop functions they seemed to work fine.
Luck;
Ken
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