I was thinking applying a God of War/Dark Souls/etc approach to the game, where people could have the option of a simple Dodge rule.
The option would be something like:
When choosing to Fight Defensively you may choose to either add +2 to your AC or you may choose to attempt to actively dodge attacks.If you choose to actively dodge attacks, subtract 10 plus your dex bonus from your AC for the round and roll a Reflex save for each attack roll an opponent makes against you; with a DC equal to the total attack roll of the opponent.
Now, that's fine and dandy; I don't think it'd unbalance too much as someone with a +9 reflex is not toting 20AC, and even if they are they're forfeiting a lot of it to max-dex.
Say it was Leather and a Heavy Shield for +4; this would (at 4th level) be about +13 to your check; where optimal armor is about 24. A difference here is that your dodge is much more subject to variance.
Any thoughts? I haven't found a system for this (and i'm sure it exists.)
Additionally, I could see it if Dodge was purely against the actual roll, giving a flat 50% success (maybe Dodge adds +1 to such rolls) as a way to give vivid dodging capability.
I don't think the system can support this mechanic.
This may be of service to you. See mechanical changes. If it's not enough, let me know because I have something else for you.