Let's try an experimental change to Zed.
Q no longer damages minions. (Think Ezreal W)
However, E does 25% bonus damage to minions. (Possibly scaling 5%/10%/15%/20%/25%)
It lowers his safety in lane without removing his split pushing power, and his farming under turret isn't really impacted since that was all his passive with occasional Es anyway.
Its a nice change to gauge exactly how much safe, early, no cost CSing benefits him.