I think you are going to wind up upgrading. I don't think you can get to the old stuff anymore. The new format isn't bad.
Not sure what you have read or what aspects you are talking about. I have Genres selectable on my upgraded 30G Zune, and I can edit about anything that is shown on the new interface on the desktop. I'm just not pleased with the limited amount of stuff shown. That is Song, Artist, Album, Genre, Heart (rating). No way to add time, composer, etc. Most of the other info I wouldn't want to edit though.