hi!
It appears I have found the skill modifier for the attack speed:
"SkillAttackSpeedQuot = 5"
I changed it to "1", and got a bonus of (around) 68% to attack speed, while just having 19 points in "dual wield".
so the lower it is the faster you'll be.
the same goes for: "SkillMoveSpeedQuot = 15"
although this one's for movement speed.
correct me if I'm wrong but don't set it to zero because you can't divide something by zero.
hope this helps someone