Hmm, okay, I don't know about OpenOffice and this is a little round-about, but you could use Mobipocket Creator to create an html version of the PDF and then copy and paste that from a browser. Then you'd at least have a better source material in OO as you won't have all the problems with line breaks. Mobipocket Creator can also - to some degree - handle footnotes and header texts.
If you're not too picky, and for my own taste I find it works okay - you can just use the html and convert to e.g. lrf in calibre. There might be the odd error in the text, but I don't find it hard to ignore. A lot of footnotes can be a problem though.
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