No,
you can install epubinfo.app.
http://www.mediafire.com/download/di...j/epubinfo.zip
Edit extensions.cfg and include epubinfo.app as the first place.
In parameters -> Personalize -> Default reader for ePub -> set epubinfo as default.
Then the first time you open a book, it will open with epubinfo. you will see information about the book, then a long press on the screen and you will be able to choose which reader you want to read the book.
Take care if the book have been already opened it doesn't work. So you need to close the book and go to the library, and then do a long press on the book, epubinfo will start.
Enjoy