The way I would handle this is as another Close Combat skill, such as Two-Sword Fighting, Two-Knife Fighting, Two-Axe Fighting, etc. The rank for the skill is 1.5 times the rank for a single such weapon (round up), so Two-Knife is rank 2 and Two-Axe or Two-Sword is rank 5. Using two rank 4 or 5 weapons would require a lot of explanation on the part of the player, so the basic rank stops at 5 (6 if the weapons are exceptional).
The disadvantage is no shield: -1 defensive rank, no shield magic, bad (-10 minimum) improv penalty to block missile weapons, etc. If requested, the player could trade the additional attack rank for a +1 defensive rank (this makes up for the -1 rank from losing the shield, but still doesn't help vs. missiles). Defensively, Two-Knife Fighting is rank 1 offense and +1 rank defense, etc.
I wouldn't allow two attacks without the -3 penalty on the second because I don't think that the fighting style imparts an ability to split your attention in such a way as to attack twice as often. (I also prefer to have fewer die rolls per attack.) Also, two attacks seems to be the most abusive option.
Thanks,
Andy
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