Give option to make Artist separate values like Artists field (preferred by some Classical users)
Certainly testing with Roon with Flac expects ALBUMARTIST to be multiple values, if you do that then can click on each artist individually, if you dont you cannot. Obviously lose some join context (&, ' etc)
and for ID3, you can get round it by using the file delimiter option in LIbrary:View Settings
e.g but this is only going to work when separated by , s or ; - as this field matches the cover it may say with or and between performers, so new options would be useful.
Got the basics working now.