With the films I've done, I've written on them, I've acted in some of them. And even ones I haven't acted in, I've acted them out just to be sure another actor can do them.
For me, if I had all the money in the world, and I could finance my own films, I would do whatever.
Usually, I have in mind what I want to do. I shoot pretty economically, so I'm not shooting tons of stuff that I could change, all that much. I'll cut something or add a little something back, but not too much. This is maybe the producer part of me, but I'm always worried about the budget, so I shoot what I know I need to shoot for the film.