[parkher]

My main problem with cr3 is that the size of margins is restricted, if 60 exceeded - sets to 8.
Therefore it is not usable with 9.7" 902 where I need margin sizes 130 each.

Therefore, my primary reader for now remains fbreader180.

Margin sizes = 130 is an absolute must, the deal breaker.
On 902, reading with such margins is a million times more comfortable, just like a real book only better. Because the width of the text is optimal, and the size of the text on page is exactly the same as in a real 8" paperback, while wide margins provide additional comfort.
Such comfort cannot be achieved by a smaller screen or by margins of the default fbreader.