Judging from the firmware updating, I think Bookeen will never improve pdf support. They would rather like to deteriorate that!
I have the same issue with the PDF files, math, physics, formulas, figures staff. Now I convert all the pages of the pdf into images, then crop, resize and rotate to fit the Cybook screen, and the compile all the images into a single pdf. If the size of the image is the similar to the Cybook screen resolution the resulting pdf file will not crash the Cybook. Basically I let the computer to render the pdf files for the Cybook, the Cybook just do the display. I think this is a quite universal way to support whatever format you would like to use.
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