Briand : read the story here in the forum
I believe it's clear there's the tag, but not in all versions of id3. We can support it if we drop support to the others, but to keep doing different things end up in other problems, as it was widelly discussed.

I know it's far from optimal, but there isn't also a single shot that kills the problem. some players uses their compilation, their method and we will not create one.

If there's a standard that is working across people's mp3, please tell us and we will humbly fix our mistake : / but up to know no solution was bullet proof, and always brought other issues to the table. Fix one problem to have complaints from the other side? no thanks.

Br

Marcelo