Most pet may casts are pretty helpful, but sometimes you might not want them. For example, I have a pet on my fire wizard that can cast furnace, which is a great aura and all, but I might not want it to do that when I'm fighting an ice enemy. I could just unequip the pet, but that would mean any stat bonuses or other may casts for that pet would be gone too. I think people should be able to toggle each may cast on their pet on and off whenever they like.