Believe or not Stephanie Meyer didn’t really have much of a say. If you read her blogs on her website, during the casting process she voiced who she pictured for the roles. She has very little if any input on the movies after selling the rights of the book.
They will turn to her for advice and she’s welcome on set but she doesn’t get a say in who gets cast. That job belongs to the casting director, the producers, and eventually the director of the film. For the first film when the cast was being assembly the casting directors turned to Kristen Stewart and Robert Pattinson.
Meyer expressed that she can really see them in the role but of course not her choice. The casting directors also scrambled to find a Jacob in the 2 months before shooting. It was very last minute and they were desperate.
Usually in every movie the input of the original author stops once they sell their rights of their book to the distributing company. The movie becomes a separate project that they have no hand in. Unless specified in the signed contract that the author will get creative say, then it mostly is up to the current staff of the movie to do with it what they may.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.