Yeah, PDF support is a different bugger all together. No one has that wrapped up, and it's unlikely it will happen soon. PDF has turned into "digital paper" but it's become digital paper because it it looks the exact same when printed out no matter what views it.
Making it "just work" on an ebook reader with a screen a fourth of that size is no easy task.
Quite frankly, I'm shocked their conversions work as well as they do. But hopefully as things like this become more common we'll see more things put into PDF formats that are easier to deal with. No double columns, etc.
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