I'm fine with it the way it is, but I think my ideal version would be a database where each release has attributes for release date, release type (album, ep, single, promo single, etc.), and whether it's a regular U2 release, an appearance on a soundtrack or compilation, solo work or collaborations. Then you could choose to sort them by any of these, but with the other attributes displayed. I've often wished I could look at a chronological list of all releases, but with the info displayed whether it's promotional or commercial.
The current "By Song" listing should be retained in addition to any new navigation you come up with. It's incredibly helpful in different ways than the release listings.