How about this for a crit rework?
Make it all work like Ashe's passive, only make it stack up while attacking stuff instead of when not attacking stuff.
So where an item would previously have crit chance, it now adds to how many stacks per second you get.
Making it stack on time rather than autoattacks (to separate it from the likes of statikk shiv and Caitlyn's passive) would be an interesting change i think.
Makes small amounts of crit a lot more interesting as a guaranteed payoff while still having neglible effect on their own.
Makes crit a lot more useful on slow attackers, since it now doesn't scale as well with Attack Speed. (is this a good or a bad thing btw? scaling worse with AS?)
on-hit ability crits take a drastic hit though. I know I'd miss my critplank.
For a balance point of how quickly your stacks should accumulate, i'd say that when you have the equivalent of current 50% crit chance, you should crit about every 2 second, the theoretical max for Spellblade procs.
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Changes to Ashe's passive: Crit also stacks when not attacking, tune the innate stacking she gets since it applies in more situation and stacks additively with crit items in an entirely different way than before.
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Changes to Yasuo's passive: lots of avenues to take, the most obvious one being a scaling with attack speed to how quickly the stacks stack. I think.
Does this sound interesting at all? boring? badly formatted? game breaking? is this a nerf to adcs? is it too much of a nerf? is it easier to balance than current crit? harder to balance? am i even posting in the right place? (seriously, this does belong here right?) would it be better or worse than crit stacking ala Caitlyn's passive? Feel more organic maybe?
It was just a random idea that struck me and I figured I should throw it out there.
It's basically, "how about if crit was on a CD that only decreased while you were attacking" isn't it?