Can you (freedb) add more genre categories to the database?
It’s theoretically possible, but we won’t do that, as a lot of programs rely on exactly the 11 current categories to exist. Additionally a lot of entries in the current database would be misplaced, if we added new categories. But there’s a better solution: If you’re using a program supporting protocol level 5 (e.g. the latest versions of CDex, dMC and Easy CD-DA Extractor), you can store any genre name inside the database entry (additionally to the general classification)!