I don't think that I would want 10 movies but I would love to have more of the books. I would absolutely love to have the whole Saga from Edward's POV to go along with Bella's. I would love to be able to compare the two and see how similar or how different their POV's would be. I would also love to know more about Jasper & Alice, Rosalie and Emmett, Carlisle & Esme as well as the Volturi (starting from when Carlisle left them).
I would also like to hear what happens between Jacob and Renesmee as she grows up and if they do end up getting married and whether or not it would be possible for them to have a family too.
There is so much more that Stephanie Meyer could do with this Saga and these characters that she has created that we all fell in love with.