Well, when I purchase a book, I like to retain all it's formatting and don't like doing an epub-to-epub conversion. However, most publishers don't do a "perfect" epub (in my opinion) and usually require a few css and xpgt tweaks before I load it on to my reader.
However, the publishers use a master template, so the changes I like to make to one book are identical to any other book by that publisher. This of course gets very repetitive very quickly...
So I was wondering if it were possible if someone was interested in making a plugin that would open an epub, run a series of find/replace operations on the css and xpgt files within and repackage the epub -- basically an "automated" Tweak Epub feature.
For some reason, Penguin books scale down the fonts by one "size". so a typical body paragraph has the following style
So therefore, when I make my alterations x-large becomes xx-large, large to x-large, medium to large, delete small, x-small to small, xx-small to x-small. I also like to change the indent to around 1.3em.
I also like to change the margins in the page-template.xpgt to 5px.