COPS 0.0.4 is out with the following changes (First post to download) :
* More code refactoring to simplify code.
* Changed OPDS Page id to match Calibre2Opds
* Add icons to author, serie, tags and recent items (there is config item to disable it).
* Fixed author URL
* Added publishing date (works on Mantano)
* Added Tags support
The download link is in the first post.
I have also updated the HTML catalog, but for now I didn't test everything on my Kobo so remember it's a very early alpha.
I've added the search and a way to see the cover and book synopsis.