If you ever need to buff Master Yi (you probably don't though).

There is actually a neat change you could make. You know how his meditate pauses his ult timer and his wuju (E) timer?

Make it pause ALL buffs. (Although this would be really hard to code, because you would still want de-buffs and cooldowns to tick down, otherwise you would run into the strange use-case of him not wanting to use it while debuffed/things on cd, which would feel wrong).

I use my ghost summoner and trigger my lethal tempo keystone, and then meditate mid-fight? Pause their timers.

Why would this be a good idea? Because currently, if I am in the middle of my ult, I have to choose between extending my ult and losing my other buffs. Because while my W will extend my ult, it won't extend my ghost or my keystone which may be triggered at the exact same time.

(This is just an idea - I don't expect this to actually get implemented because I think Yi is fine right now balance-wise. But in the future, if his winrate ever dropped..... This is an idea.)

EDIT: this may not actually be that hard to code (or revert) if you limit it to just a few core buffs, eg: red buff/blue buff/keystones/ghost. And you could always add a couple more every patch if you felt there were more "core" things Yi made use of often.