Its great the latest version considers disc when sorting by track. I'd like to request another feature to help with the presentation and navigation of playlists.

When using the disc / season keyword in the hierarchy, if the tag field is blank do not generate a 'disc 0' tree branch. Only create disc 1, disc2, disc n, if the disc tag is populated. I would not ignore a value of disc 0 since this can be used for specials, one-offs, and bonus material.

Some classical releases and boxsets have many discs so navigation by track alone is cumbersome. Adding season / discs helps this immensely. However, this has an undesired side effect of single disc releases having a purposeless 'disc 0' tree branch, even though the disc tag is not populated.