It would be great if the artist comment would be available for scripting/metadata/plugins. This is a little difficult, because there can be multiple artists and albumartists in NGS, and other than with the artist and albumartist tags, we don't have meaningful connection phrases (like "&", "feat.").

There are multiple options how to handle this:

• use join phrases from artist field ('"the famous model" feat. "the unknown jerk"').
• don't set _artistcomment at all for collaborations
• use some generic join phrase (e.g. ", ")

I would vote for either the second or the third option.