Feature: Leave books in current location
Calibre copies all added books to a central location and enforces a certain organization of that folder structure.
I've collected ebooks for a long time, and have a reasonable (22 gigabyte) sized collection, already organized to my liking and spread out over local drives and network drives.
I'd love to be able to organize this collection using Calibre (seems like a great software!) however, the copying of added book to a central location is really limiting my usage for now.