There aren't any options besides those provided in the GUI, currently. The source code is there, however, if you want to play with it. Too bad theguru hasn't been around lately, though.
I don't really understand what you're looking for, though. Does the PRS-500 even support PDFs? I thought it didn't.
PDFLRF works by convering the files to images, which is why the files are so big, but that's what makes it possible to darken the image. (It isn't changing the font.) If you want a different font but still a text-based file, you'd be better off, I think, trying to convert the PDF to a different format and playing with it from there. How well that works depends a lot on the specifics of the PDF.
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