As of firmware 2.9, state are available in KePubs, but not in ePub or Kobo-ified ePubs (the KePubs produced by my plugins). Page numbering by default is per-chapter for KePubs (both mine and Kobo's) and full-book for ePub, but if you prefer full-book page numbering there is a driver option to force that. Image zoom I haven't used much, but it works well for me in generated KePub books. As for the rest, I'm sure there's someone here who can speak to how it works