Yes, "dual weilding is the way to go!!" Since I have several runs with my PC for the game, he is wielding Crom Faeyr on his off hand and either Daystar or Celestial Fury on the main hand, 3 slots are spent on weapon style dual weild, and I think 4 (or one of them might be 3) points each on hammer and longsword. I did dual him at high level, 15 if not mistaken since I have the exp cap removed. I have other berserker/mages, but they usually only have 3 attacks per round w/o the boots, so the effect is wasted.
As for the attack speed, I normally take the time factor of a round (which is what?? 9 or 10 or some other unknown number?

) divid by the speed factor of the weapon to use as a rule of thumb for number of basic attacks you get per round. But like I said, this is only an estimate.
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Long live H22A1!!!!!