oh yeah, it most certainly is a release~
for releases such as this, track order should be alphabetical by title, just like it would be sorted in a folder on your computer. an example I’ve added is My Little Pixels. I remember I read this guideline somewhere in the docs a while back, but can’t seem to find it at the moment…
you can also remove the track numbers when entering the release, since they technically don’t exist. I will note that if you use Picard, it will almost certainly still add track numbers to the filename, unless you specifically set up your file naming script to handle that… (I could help you with that, if you’re interested)
for multiple file formats, you can just double each track, kinda like this release. (note, the track listing was imported from Discogs). be sure to note this in the annotation tho.
a note on doing this, the MP3 and WAV files should likely be the same recording. note how the recording Blue Comb ’78 inst is on the exact same release twice.
a note on metadata that “MB likely will not be setup to accommodate”, there is always the “Miscellaneous support” relationship, if you want to take it that far. an example I’ve edited is the video for Unison. if not, you can always just add that information to the release annotation, like I did with 3時12分 or The Birthday Girl vs. the Internet. it is better than nothing~