I've had thoughts along these lines, but they've mostly been focused on the "writer as auteur" -- many of which are included in the Director's threads. But say, Charlie Kauffman, is included for the couple movies he's directed, but that's not where his greatest influence lay. And Aaron Sorkin gets nothing. But they are certainly auteurs as much as any director.
What I wonder about is compiling a group list of auteur screenwriters, in which all of their films would be included. I was thinking of polls of their work, like the Director's polls. But is that the best approach?