I find the "Writer" column strange. Sometimes it's the author of the screenplay, sometimes it's the author of a book from which the film was adapted, or out of which the film was inspired. It's strange to see Tolkien as the "Writer" of the LOTR movies.
Yes when I saw Stephen King as the Writer for Shawshank Redemption I was surprised, didn't even know that was based on a short story by Stephen King. But the writer or screenplay was by Frank Darabont.
I had to choose one name per movie.
If a movie is based on a novel, I believe the author of the novel should be credited in the first place. Usually the script degrades the quality of the novel.
