Ok but why not exclude role/instrument field as a factor in searching for pictures and make display artist entry priority or an option. The search results using artist and role instruments set as artist are worse, at least for rock bands.
If there are user out there, who use artist:instrument/role like this (which I love btw)
Chris Casket: Bass
Gregor Mackintosh: Guitars, Vocals
Guido Zima: Drums
Ben Ash: Guitars
for them it makes all things artist picture related useless.
Nevertheless thanks for help.
Maybe this is solvable without you changing MB's track associations.
Related to this picture problem is that also theatre mode xml don't work.
found this line and changed tags="artist" tags="albumartist" doesn't do the trick.
<element type="Gallery" x="1" y="1" widthDock="Panel" width="-2" heightDock="Panel" height="-2" aspectRatio="zoomKeep" interval="60" tags="artist" ></element>