Riot wants Self Quick Cast to be Self Normal Cast
I just spoke to a Rioter who told me that it is intended for quick self cast to apply to allies when the cursor is hovered over that ally. This is flat out the wrong idea. The whole point of quick self cast is so you can quickly use an ability on yourself regardless of where your cursor is.
Rioter Quote: "if you use self-quick cast, it will still target the ally if the cursor is closer to them".