As far as I can tell, this only make the HDRi tile/repeat. Let's say I have an interior shot where I want to see the HDRi in the background through a window. Were I to use a simple sphere with the HDRi applied spherically, I could reduce the size of that sphere and I would see more of my HDRi in that window (without tiling the image). What I am wanting to do is scale the actual sky object so that my background image is at a more reasonable size.