Perhaps they need a new skill:
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Ambidexterity
Train you off-hand in combat, allowing you to arm two weapons more proficiently. Your Strength/Agility must be geater than the total Strength/Agility requirements of both weapons.
Level 0: Two-weapon combat suffers a -75% Offence penalty.
Level 1: Two-weapon combat suffers a -60% Offence penalty.
Level 2: Two-weapon combat suffers a -45% Offence penalty.
Level 3: Two-weapon combat suffers a -30% Offence penalty.
Level 4: Two-weapon combat suffers a -15% Offence penalty.
Level 5: Two-weapon combat suffers no Offence penalty.
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This will allow anyone to wield two weapons, given they are skilled enough, but also make it harder for them to hit as they are not used to it.
