Quote Originally Posted by VendenBos
When entering the collaboration artists, it is not possible to set the sort name of the artist. Existing artists are recognized and the existing sort name is used, but new artists are sort on their full name and I have to change it in the artist view.
Additional controls for setting sort names will be added eventually. I ran into problems implementing it - hopefully it is not a deal breaker.

You can always add sort names via menu Library -> Manage Artists.

Andrei