@Meddler or whoever: IE idea let it marinate in your brain.

So before I start you have to read this new crit formula suggestion as this IE change would go hand in hand with it

New IE minor change:

80 AD 20% crit chance Passive Unique: +40% critical strike damage (+0.5% per additional critical chance, up to +50% critical strike damage)

So according to this proposed crit formula where everyone starts with 33% critchance and 100% crit damage: you would get +60 bonus crit damage from the 20% crit chance on IE. Giving you a total of 160% crit dmg. By giving IE's passive 40% crit dmg it would neatly round it out to 200% flat with just IE.

to recap you get .5% crit damage bonus per 1% crit chance (after 20%) up to a maximum of 10% so you can reach 50% later when you reach 40% crit chance (aka IE, shiv)

Since you're down -10% bonus damage early game if you rush IE, IE could be priced ever so slightly lower at 3750 gold which i think helps because atm its so far out cost wise.