@kiwidude:
I would like to request a further enhancement to your very useful plugin.
It would be most helpful to have a search/replace facility added. This would work exactly like the regex search/replace in calibre conversion, (including save/load sets), but would work on the xhtml files of the finished ePub rather than on the intermediate xhtml seen during conversion.
What do you think? Is this complicated? Would other users also find this useful?