Thanks for you quick reply.
Don't you think "Music Brainz Release Id" would be more appropriate for grouping release ?
Grouping can really by used for various purposes.
I was thinking that may be an option to use grouping or not could be nice.
I tried the "album artist/album - disc" view which effectively does not use the grouping, but it always displays the disc number.
I think if "total discs = 1" we could get rid of displaying the disc number.
I haven't coded c++ for a while but if some of the options above look interesting for you, let me know and I can try to PR something.
Thanks for you player anyway