pdf are handled very well by KOreader, reflowed or not.
I have some suggestions.
- addd SEARCH book's title in the list
- option to use amazon's built-in dictionaries
- option to set fonts ' type and dimension for the book list (big fingers cause some mess selectioning a book ...

)
- option to use alternative fonts stored in \fonts folder
as -generally speaking- KOReader as well as amazon's choice of fonts is too poor and lacks bold fonts that I find very useful (I use looking glasses)
thank you so much