title basically says it all. I'm thinking Diablo II, for those who are familiar...reach a certain level of strength, or a certain level in two-handed weapons or something. Gain the ability to wield a traditionally two-handed weapon with one hand, freeing the other hand to hold a shield, or another two-handed weapon.

Obviously, there would be some sort of handicap...perhaps not hit as hard? Or a blow to speed?

Alternatively, the ability to dual-wield crossbows, when the add-on comes out. Or a crossbow in one hand, an axe in the other. I dunno, I'm just rolling the idea around.

Does this mod exist already? If not, how difficult would it be?

It would require a way to change a weapon's animation type from two-handed to one-handed.

*runs to SKSE thread to request a function*