SUCCESS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Well ... partial, anyway.
I've discovered with .PDFs that you can do the following:
1) Open the PDF, and let it display on-screen as a single page
2) Hit the Zoom buuton. At the bottom of the screen, you'll see a message saying "Press D-pad and ENTER to confirm"
3) Press the Down arrow, and the Enter key
4) In the bottom right of the screen, two crop marks making an artifical "corner" appear. Use the Left or Up arrow keys to move this corner up diagonally toward the top-left corner of the screen. It will only go about one-third of the way
5) Press the ENTER key, and the screen will zoom in to show only the section of the document bounded by the top left of the screen and this artificial bottom-right corner designated by the crop marks
6)
NOW press the OPTIONS key.
There's a new item on the Options menu, called "Reflow ON" -- select this, and hey presto! The Story now reflows PDFs.
And now, if you press the Zoom button, it includes the words "Reflow On", and it zooms on the reflowed text (i.e. you don't have to go through the whole rigmarole I've detailed above all over again.)
So. I think this is great news. I've tested it on PDFs with text in columns, and it handles the text correctly, flowing correctly from one column to the next. Fantastic.
Now, the head-shakes. I can't immediately think of why the "Reflow" isn't the default option, and why it has to be switched on manually. Maybe there's a reason, but I can't think of one. But given that's what the OS designers chose to do, why on earth wouldn't the options to turn on Reflow and Screen dithering be included on the "Settings" menu? Why are they hidden away on the Options menu, in such a way that they only even appear under certain conditions and after you've struggled to make the document work properly? And then not even mention these options in the manual?
Perhaps we'll never know. Gakkk.
Ah well, I'm off to play with my DOCs.
More updates if I have any success.