[TechniSol]

I suspect there has been very little time put into modeling the real world in terms of a hierarchical model of sections, shelves, etc. However, if you give up the multilevel interface requirements, you can easily create collections organized whatever way you like... ie, it would be possible to create a collection called History:WWII:Japan and other collections like History:WWII:Artillery, etc. The multi level aspect would have to be in the names you assigned.

Calibre as a management tool is MUCH quicker than organizing a bunch of books by hand and once done allows you to recreate a whole raft of collections simply by syncing the reader to calibre again. Plus, Kobo's database requires you to only store the book once, but also allows you to have it appear in as many collections as you like. To me, that, and the ease of recreating the collections with Calibre make the database approach worthwhile, if perhaps not fully realized yet by Kobo.