@iri1
1. Thanks. I'll try and see what happens.
2. I understand that, but in the past I tried CoolReader3 for JailBroken official Kindle 4.1.0 and there were page numbers. You know, I've changed font size and layout once, I like it and I won't change it in the future. So I thought that Duokan could calculate how many "pages" - I mean screens - are needed to show whole .mobi file in that certain font type/size and show this value in the top/bottom. I believe that's how CoolReader3 does it, and for me it makes reading on Kindle much more "paperlike"
3. I believe you didn't understand me, because of how I wrote about it. Just try to view any document in Duokan, go few screens forward, notice what is first line on that "page", go one "page" backwards and you'll notice, that this first line is now the last line. The layout isn't fixed, even if I don't change font type/size, and that irritates me a little.
Anyway, thank you for your answers