i don't have the 600, but i do have 505. I find that it even if font size is specified as point size, you still can change it on device to the 3 sizes (s, m & l). The font size in epub is used as the 's'. So the absolute size can be scaled on device.
if epub has the pages encoded as images rather than html, then i guess your out of luck in changing the font sizes unless the 600 can do image zooming.
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