epub as singlehtml without related and footer
As ebooks are read continously, there is no need to split them into several html files. But if they are split we should avoid to have the navigation links on top of each file and the footer information at the bottom.
So I would propose to skip <div class="related"> and <div class="footer"> from the generated files. There is no need to have the navigation and the copyright disclaimer on each file.
At least this would be a nice option.