Or maybe give it a cast lockout simliar to how Akali's R has a lockout between R1 and R2 (though to balance her assassination power from being godlike in Akali's situation). Not saying it has to be a massive lockout, but a decent one. Something like 1 or 1.25 seconds sounds nice, but also open to maybe .75 if people who play and main her would think something like that could help. I feel it would help so that people that accidentally input a move command when they ulted don't get mega screwed over and have this long cooldown to ponder over as "I fucked up super hard."
End of the day, I don't really play her, but I understand where these people are coming from. People think that some champions that can be "overbearing" at times have mains and players that want to have their champion at the top and terrorizing the ladder. Reading that post should be a wake up call to the community that not all mains and players of champs like Kat, Yasuo, Riven, etc are not power thirsty assholes, but people trying to make their champ fun but also still be balanced so people don't need to instantly be like, "Oh, this so and so person on this champ is gonna feed so hard." or "We need to ban this champ because its too overpowered despite being very under powered in other ELOs (Yasuo)."
If the community wants change like this, they need to lay off the non-info personal bias hate posts and try to be what Gameplay + is trying to be: A community that discusses changes, brings up ideas with use of good concise info they can get their hands on, and work together as a community to help Riot with balancing the game to be fun for both causal and hardcore fans alike.
Right now the community is split between people who don't want to put an ounce of effort to giving ideas with info and would rather bitch all day, and people who use precise and correct info in their posts and people hate said champion and downvote the post into oblivion. I'm gonna make a post later (or shortly after I post this comment) about my experiences with this game that i've had for over 5/6 years, and bring up this kind of issue and ask Riot a favor or something (depends). I'd advise anyone who reads this to read that post when it comes out, it will be either under Gameplay (where we are currently) or General Discussion. Thank you.
(Sure, i've had comments in the past that were defending Yasuo, and I used ELO and knowledge as a pedestal for my arguements, but now that just doesn't matter to me anymore. It hurts me a lot seeing the community like this: Broken, Confused, and Divided. This game has done great things for me in my life during the worst of times (will mention in the post), and I just feel helpless in trying to fix these issues. I'll speak more of this in the post since i've already dragged this comment on long enough.)