I can almost guarantee some mechanism for getting this done appears in a future 2.0x release. Peter and Roger are big fans of genres which involve remixes, co-productions, and the like. And now that it's EOL, features that the programmers themselves want are much more likely to be on the front burner. There have been several methods suggested, including using ID3v2's support for multiple artists and/or the other ID3v2 fields, but no specifics have been mentioned yet.

There are older threads somewhere around here discussing this possibility, including some with piqued interest from the Empeg guys. So don't hold your breath, but I would think this one has a good chance of happening soon.