Suggestion: Make Self-Targetable Spells Cast on Self by Default When Targeting Nothing

^Title.

Basically, the premise is that if, as a champion with a spell you can use on yourself (e.g. with her heal, with his Blood Boil, with Creeping Death, various shield champions, etc.), you cast that spell while very clearly not targeting any valid unit (i.e. there's an obvious distance between your cursor and the nearest valid unit), you should cast that spell on yourself by default, or at least have the option to do so automatically. I feel this could optimize clicking and cursor-moving, especially in heated fights where it can be somewhat difficult to target yourself when focusing on the action farther away. With the upcoming changes to Nunu and Morde, I feel it would also help optimize those spells, where activating them on the fly would automatically buff yourself and a nearby ally.

Note: This isn't about reducing champion difficulty, even in the case of champions like Kayle or Nunu, who have relatively simple mechanics. Rather, I think this would optimize the use of those abilities by making them less cumbersome to cast in some situations. Point-and-click abilities tend to not be the best place to showcase the greatest amount of skill either, so if some champions would become too simple with this change I think that would say more about them than about this particular suggestion.