I was just thinking. Maybe you can have all of the categories you want, but just the five categories you mentioned get trophies. Maybe the winners in other categories can get a certificate of a plaque, or maybe an icon attached with their flash page that says they won a yearly award.
I feel that should be the way with all awards shows too. I think its lamesauce that someone can win a best picture Oscar (the most prestigious honor), yet someone can win the exact same trophy for something like best live action-short. It's like a reward for being half-assed.