Yeah, I am not really a fan of blowing up small images, makes them blurry, so there is no option to do that. As for the popup footnote, wait for the next release, as I have removed the mapping of epub:type to role, then use
Code:
@namespace epub url(http://www.idpf.org/2007/ops);
[epub|type="footnote] { display: none }
.calibre-footnote-container [epub|type="footnote] { display: block }