Roon currently shows the record label in the credits. I think it would be great if Roon could show the catalogue number also. If this info could be pulled automatically then great, otherwise let the user enter it if they want.
On another note, this ties in with a request I added some weeks ago - please allow Roon to show the record label on the main page, as well as under credits. A good place to put it would be next to the release year (as this depends on the version and label of that particular release).