'Twilight' scribe Melissa Rosenberg says she'll leave those decisions up to director Bill Condon.By Jocelyn Vena, with additional reporting by Josh Horowitz Melissa Rosenberg Photo: MTV News Now that it's been confirmed that "The Twilight Saga: Breaking Dawn" is being split into two flicks, fans want even more details on how screenwriter Melissa Rosenberg will adapt the Stephenie Meyer novel, which includes a lot of sex and an incredibly gory birthing scene, into two PG-13 films.