I guess my suggestions are quite tamed but:
- 2 dates: Added and Read
- 2 options for home screen: last added, last read
- 2 more sorts: series and number of pages (not KB)
- Header configurable: with/without title, with/without clock
- footer configurable: no footer, pages, screens
- Ability to see total number of pages (or screens in the book)
- Multilevel support for index
- Rodolex for shelves/books instead of slide (or plus slide)
- Automatic "series shelves" and autor "shelves", controlling minimum number of books
- Add tag information and pages to book details
- Ability to choose dictionary or translator for each language