Making Xin's new W cast time scale with your Attack Speed was a great idea!
And how about doing the same to 
's Q or E? Maybe shortening his Q delay the more Attack Speed you have might get a bit OP, because then you have a mini Malphite Ult on a lower cooldown, but it would definetely help his E more in teamfights/fighting ADCs since they can't dodge it as easily as before and can't kite you as hard because it is an important slow.
