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If both weapons are below 50 the penalty is cumulative. Let's say you had long blade at 60 and short blade at 40 then you attack at 55 because of a -5 penalty for lack of short blade proficiency.
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Goes a bit more in depth about fighting with two weapons. In general the offhand weapon is both a parrying and weapon of opportunity. Possibly the greatest swordsman of all time Miyamoto Musashi dual wielded a katana and wakasashi. Among duelists on the the other hand this was not so much the case. It was historically rare among line fighters. How would that work in practice? Be able to swing the secondary hand using another mouse button?
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I still think i should only be able to swing one at a time however. I never understood why i equipped both in my hands but had to switch to see them.
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