Originally Posted by ijdod
Found the post related to that, and management of those through Calibre. While far from ideal, it's far better.
Shelves run to the problem that when you hit a certain number (at a rough guess, less than 100), opening the Shelves takes way too long (6-8 seconds). So much for that idea. Of course, I can think of a few workarounds, but all that wouldn't be necessary if Kobo just implemented browsing through directories.