I would be very interested in an editor and/or co-author field for articles. I would like to be able to add a user that appears in the template just below the author’s name. This way I can credit my editors and co-authors appropriately within the post or page.
It’s already possible to have multiple authors on a post – if your theme only displays the first one, that’s a limitation of your theme, not Ghost in general. (There’s not a mechanism for someone to be designated ‘editor’ , although you could say that the first author in the list is always the editor and then remaining authors are displayed as authors, for example.)