Right now if you open all the gates in your park a T. Rex or Carnotarus or something will just kill hordes of defenseless herbivores. I would like it if hunting was only done when the carnivore wasn't near a feeder. In reality, a helpless goat or carrion would be a much easier source of food than a Parasaurolophus. Or if carnivores conserved food that would be also be great. For instance, a Carcaradontasaurus fights off an Albertosaurus to defend its hunting rights to some Gallimimus.