Originally Posted by frostschutz
also contains some suggestions about small caps.
Seems to me though as if there just isn't a good solution.
My current calibre settings would filter your smallcaps hack right out. There are too many books with whacky font sizes defined in them - on Smashwords probably because they use Word/DOC as a source? - so font size is one of the properties I filter out when converfixing books.
ePub > ePub in Calibre can be a really bad idea. Don't do it. Power up Sigil and fix the ePub from there. Besides, if the ePub is made correctly, there's no need to ePub > ePub.
As for the smallcaps using a font size being a hack, it's how nearly all ePub do it. So if you ePub > ePub all of you do ruin some things like smallcaps.