All the confusion with adding has made me to add books few at a time - easier to control and keep track. Once I found to my horror that new mobi had overwritten old one (strong
no-no for me, I want to compare them first. In such cases I prefer to add duplicate book). Also I add additional formats in book edit panel - so I can be sure they go to the right place.
Would be nice of course just to drag everything into library and then sort them with adding dialog box.
Some situations I've had:
1. Already have the format, but from another source - Make duplicate book entry
2. I have tweaked the format and like it - Don't add
3. Have different format, from another source - Merge and move book to the top (for easy finding, now I have to search it out to enter source info)
4. Already have duplicates of different formats - Ask where to merge, give option to abort (I won't be sure which one I want before rechecking
)
Most of all I miss abort button - so that I can drag 20 books to the library and if any surprises occur, not add those 5 books this time.
Would surely be wonderful to have 'Add books' dialog with many options, but I'm afraid there's already enough balls in the air as is.