categories listed separately and everyone vote for as many or few as they'd like.
more points to the ballots that have more nominees in order, but if you just want to post one nominee, they'd still get points (on a sliding scale). use the 5, 4, 3, 2, 1 system for full ballots and say, 2 points for a post that has a single nominee.
filling out an entire ballot for every category leads to procrastination and homework. I see about 30-50 new releases per year and there's always Spilled Lattes categories I struggle to fill. if you saw 10 movies, cool -- vote on those 10. if you have only two categories you care about, cool -- vote for those. listing each category separately like FYC would encourage that.