I feel that the Broken Wing's Additional Attack timer needs to be lowered (and other Riven Feedback)

So i have been fighting a fair amount of Rivens lately, and one thing that has bugged and frustrated me is how almost all Champions who will be primarily fighting her have no real way to stop her from using her combo.

What I mean by that is that outside of certain ultimates there really isn't a whole lot of CC-Abilities that goes on for 4 seconds, which means that even if you Silenced/Stunned/Knocked-Up Riven for 2-3 seconds she will still have plenty of time to use the rest of Broken Wings to either continue attack, chase, or escape due to the timer being four seconds for each cast and the timer resetting for each cast.

Coupled with how low her cooldowns for her other basic abilities are I feel this makes Riven far too powerful, especially since she has no resource she has to use to try and balance it all out. This problem also gets even more annoying when you factor in Cooldown Reduction.

One other thing that I feel is off about Riven is how she has a Shield that scales off the one stat she wants to build up most, giving her even a fair amount of survivability and such in the middle of a fight despite building little to no defense. Coupled with the low cooldown once again she has a few points put into it and some CDR you're gonna see her be popping that shield up every few seconds.