In the Album view, I want to sort the titles of this album by a certain tag. But it seems they can't be sorted by something else than the title names :-(
That is not a correct statement.
In 'Album View' you can sort the tracks to your hearts desire when showing tracks:
- in a separate panel
- to the right of the main panel
- at the bottom of the main panel
So I am guessing you are speaking of the 'enhanced panel'? (directly under…)
That will mimic how physical albums show the tracks that it contains.
And from vinyl, to cd, to digital downloads, track numbers are the key operator here.
If you have no use for track numbers as they are intended to be used, couldn't you sort on the tag that you find important, and then renumber the tracks using that order?
Still, to me it feels like we are talking about something like 'playlists' and no so much about 'albums'.
But you could create a wishlist topic for this of course.