I was pleasantly surprised by this idea: instead of Starkiller Base preparing to fire on the Resistence planet at the end of the film, have it fire on the Republic (Hosnian) — and be successful in doing so. Could add more depth to the end of the film.
Take a look at his reasoning:
https://humaniterations.net/2016/03/26/how-to-fix-the-force-awakens/
I just wonder how it would work as a fanedit — cutting out the scene showing the attack and instead moving it later in the film and not screw up the story too much.