[Katsunami]

Calibre's interface can be pared down to become very simple. I have it configured as shown in the screenshot below, but I still consider myself a power user.

I don't like the clutter caused by all the toolbars and icons, and for some reason, the Favorites plugin (to combine plugin icons/menu's) just doesn't work well for me. I don't know why, but as soon as I start using it, Calibre becomes unstable.

One thing I'd like to see changed in Calibre are the sometimes extremely long menu options, particularly the ones in 'Add books'; they include a complete description. Other menu options, such as the ones for 'Remove books' include "for the selected books' all the time, while it's obvious that only the selected books are affected. (At least, it's obvious to me, because this is the case in most other programs as well. If I'd select 'Remove specific format', then I would be quite suprised if this option would do that for the entire library.)