[JSWolf]

Don't convert graphics to webp. ADE/RMSDK does not support it. Anyone using RMSDK on a Kobo or nook or Sony Reader or any other older Reader will have trouble. Make --keep-images the default instead of having to remember to use it every time. Oh and not every firmware for a Kobo can handle webp. So you'll end up breaking things that don't need to be broken. Stupid choices for the ePub standard do not mean you have to make the same stupid choices.

.eparc is also another bad idea. Sure it might compress better, but if we actually want access to the eBook, we'd have to uncompress and there is no native Windows tool to do this. Plus. I store my eBooks in calibre libraries which doesn't know .eparc. There's nothing at all wrong with ZIP for ePub and whatever Amazon uses for their eBooks.

Why would you want a non-standard compression format made part of ePub when most people won't be able to use it. It's just going to cause all kinds of problems. Please don't. Lease the compress and graphic images alone.

Go tell the EPUB working group that you are wrong and you want to leave compression as it is. .eparc will break things.

DON'T DO THESE THINGS AS THEY WILL CAUSE ALL KINDS OF PROBLEMS THAT DON'T EXIST!

Don't convert to any image formats that cannot be opened by RMSDK on a Kobo. All you're doing it causing trouble where trouble doesn't exist.

A compression format that makes the file smaller but cannot be used is worse then a ZIP file with no compression.

Before building in these mistakes, you should have asked first if they were a good idea and we could have told you they are a very bad idea so you could leave them out.