In imovie 10 (like in its predecessors) there are a bunch of nice themes. I've got a standard one I use almost all the time. There are some things I always change, though, like the wording of the closing title. And I'd like to show a small logo at the top of the screen during the start and end of the movie, for instance.
Now... this means customizing an existing theme. Or making a new one. Only... I cannot figure out how to do this. Is it possible at all?