This seem to wander outside the scope for purist genealogists but…
I’d like to see the Author field of Sources expand to recognize a Person (or even a Family, a group of Persons) object.
I regularly add authors of my reference materials to my Gramps tree. My standard author entry is: main author/editor with contributors separated by semicolons; where each author is listed last name comma, given name(s) birth year dash death year. And this generally means finding a death year. (But I also find it illuminating to research how they are related to the materials about which they wrote.) Given the scholarly prejudices of the past, it may include a bit of detective work for female author writing under a penname or just initials.
But using a Person(s) for the Author instead of using a freeform text opens a host of opportunities.
It would allow compiling Author subsections in bibliographies. It could add publication of a book to be inserted on the person’s timeline. It would allow a relationship chart to be generated between the author(s) and the focal person/family of the genealogy.