Here's a tutorial on how to use 2 2handed weapons at once, stats do stack.
1) Wear a 2-hander
2) Have your current bag full, except for one empty space.
3) Have someone trade you two items, the second of which is the 2 hander you want to "equip".
4) That's it. First item will go in your bag, second will be "equipped".
That's the technique. Works with monks, haven't tried anything else yet. The stats from the 2nd weapon work, but the weapon is never used.
Edit:: Auto Equip must be on