Set a primary category – for a movie review site

Hey,

I’ve managed to set up WP so that it allows me to organise my movie reviews. I have lots of categories with sub-categories e.g.

Rating
|-1
|-2
|-3

I’ve also done this for the year the film was made and the genre. Doing this allows me to create pages listing the top rated movies and list movies from each genre.

The only problem I’m having is the URL structure.

At the moment my URLs look like this:

http://www.moviesite.com/year/2000-2009/kiss-kiss-bang-bang.htm

I would perhaps like them to look like this:

http://www.moviesite.com/movie/kiss-kiss-bang-bang.htm

So I basically need to set a primary category somehow. Can this be done? Am I missing an option in the control panel?

Sorry for making this post so long, have a good day.