Unfortunately the animation system doesn't seem capable of changing our characters' heights. Obviously thick clogs like the Valentione Pattens don't actually change the height of your character - rather they just make the lower leg shorter. The BLM pvp hooves drastically "shorten" the calves in exchange for the illusion of tiptoes. How stumpy do you want to make your characters' legs appear in order to give them 4" heels?

Shiva's heels are moot because she's a custom model with custom animations.