The cart and list emails use GetBiblioData (gets biblio.author) and GetMarcAuthors (gets info from 700-720). This leaves out the 110 and 111 as author is usually only mapped to 100... :(
Katrin, do you think this is resolved in part by bug 30850? We could do the same for 111
It would probably work, but with 3150 hopefully closed to be pushed, there might be other ways to achieve it too.