So having access to a more instant Stoneskin is being met with a strangely high amount of resistance... even though Paladin can already Stoneskin themselves about 5.5 times on a single mana bar. But whatever.
The main point is that there is room to add a 3rd step to the Riot Blade combo, which would give us something more to do while tanking, without overly shifting the tanking balance. I still want to push the idea of having Shield Swipe become a weak frontal cone that debuffs INT. Again this becomes moot when you have a MNK in the group, and basically brings PLD's debuffing capability up to the level of Warrior's. (-10% all vs -10% STR and INT)

As far as a stacking mechanic, it would be nice, but not sorely needed. Even something as simple as "You get hit 10 times, the next Flash generates 2x enmity, costs 0 mp, and the blind lasts twice as long" would be a nice addition to strengthen our still weak AoE aggro... but not sorely needed.