A simple Yasuo E change idea.
It's no secret Yas is frustrating to play against cough-64% banrate-cough. One contributor to this is his E and how it's mobility makes it extremely difficult to fight, and how it lets him break a fundamental rule of the game, making it dangerous to go near your own minions. So I have an idea.
Allow him to dash freely, the same way you changed Akali's ult to be a free dash.
However, increase the cool down. Maybe to something like 10 seconds. The biggest problem is this would remove his identity as the best dash spammer. So do this;
The first enemy champion Yasuo dashes through is marked, and his E cooldown is reset. Dashing through a marked champion, or not hitting any champion puts his on cooldown instead.
This would allow Yasuo to retain his dash spam. But it would make the spamming require some level of skill, rewarding him for using it properly and punishing him if he makes a mistake.
etc.