Uncapped stats on gear, which would actually make crafting useful, as well as embedding material for some truly funky builds.

Imaging a Vitality/Piety overloaded WHM for Holy bombing
A dexterity based Paladin that parries like a boss, but otherwise has lower hp
A vitality/dexterity based Dragoon that can off-tank effectively

I don't know. Something that would allow for people to introduce some variety into their builds through material usage, as opposed to the enforced cookie-cutter statistic limits he have now.