Updating the book is up to the publishers... that said, sometime in the near future I intend to add a section to 10452 covering the post 2003 releases and, er, correcting the odd error or two.
As for documenting the band's* extra-mural contributions... done it - here:
http://www.btinternet.com/~bellagio/guesting.html.
[* - the original five; Bruce has turned up on roughly a gazillion other folk's songs]