1. I wish the joystick could turn the page as I hold the book with my left hand and am used to turning the pages with my right hand.
2. Some type of subfolder navigation ability.
3. Fit to screen for reading on the laptop.
4. Automatic synchronization option.
5. Some sort of button or key lock so that the pages aren't turning whilst the buttons are inadvertently being pushed.
6. Ability to read htmls natively or at least to allow a conversion of said files.