Can we rework Kayle's E?

Ever since Jinx came out I've been wondering why doesn't Kayle's E work like Jinx's Q or Cho's E? The standard build/goal for her ATM is to get 40% cdr so you can keep her E up constantly. That's what players want out of her. She's always in a cycle of nerfs because whenever she pops back into the meta people freak out because of how her R works.

So why not rework her so players can play with her E as a toggle (or just make her a ranged attacker already)?