Well, maybe you stop dividing it on gender and start dividing it on genre.
I've always wanted to do this. I enjoy reading a Top 10 action/horror/comedy/sci-fi/fantasy etc. of the year type of lists. Although I sadly don't see enough films each year to perhaps always warrant five nominees in each category (also my favorite nominations are always the Saturn awards
That being said, I'm quite comfortable with how the Filmspots are now and wouldn't want to make it more complicated.
As for a performance category... I personally like the separation of Actor and Actress for the reason jmbossy said. It's unfortunate that I don't see enough films with female leads. I realize that is something that I can personally rectify, but at the same time... The movies I often want to see just so happen to often have a male lead.
Huh... Looking back of the three films I saw that had female leads- Gone Girl, The Theory of Everything and Wild, two of them also had a male lead as well.