Didn't read the whole thread yet but these are the features i'd REALLY like to have, most important (to me) first:
1) next to the home button when reading a book, a return/back button to leave the book, returning EXACTLY to where I opened it from (Home, a collection or the whole library, on the page where the book appear). Sometime, I browse books searching for something and this is a real pain (the number of SOOOO SLOW operations to continue the search on the next book is appalling).
<edit>Just read in previous posts that this button
existed and was
removed by Kobo, now I'm really
:
</edit>
2) both for home and library screen, a mode to have only one line of text for each book (super compact third mode). To me, reduced books covers are almost unrecognizable anyway (hence the home is often unusable). And multi-page-home (remember at least the 20 most recently read books).
3) in the library, a column on the right of A...Z * buttons to quick jump to the corresponding first letter corresponding to the active sort mode (not the same as search at all, much faster to use and only match the beginning of the active key mode).
4) an optional hierarchical mode when sorting the library by author (browse authors only then choose among books of this author, no need to build collections by author).
5) history of the ~10 last fast movements in the book with the slider (not page by page moves, and validated by closing the slider) to be able to return back to old positions quickly without using temporary page earmarks.
6) for search, a list of the 10 most recently searches (can edit the text before re-use).
I'm not interested at all with reading life/social features.