Crit Effects for other ADCs

Now that Ashe is live with a new crit mechanic, I can't help but think if there's possibilities for other ADCs. For instance Miss Fortune can attack twice for normal damage, but apply on hit for each one. Since she's carrying 2 guns, this makes sense for her. Vayne could get a full stack of silver bolts on crit in lieu of the double damage. Stuff like that.

For non ADCs, maybe someone like Shyv gets a free Q instead of a critical hit or a crit resets its cooldown to zero.