@Jellby
About the TOC:
ePubs contain a lot redundant information.
Life of epub creators could be so much easier, when ereader would be able to create TOCs based on Hn on their own.
And title pages based on the metadata.
And displaying cover based simply on the existance of cover.jpg.
And ...
Something else:
Do you fill the title element or do you just use a H1?