I think that the restriction is in place due to the way that BG2 handles off-hand attack.
The infamous Melf Minute Meteors Off-hand weapon combo (Allowing you to hurl Crom Fayers and Celetial Furies after people) gives a clue why the restriction is in place, this particular bug being the loophole.
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The Bleak Caballero<br /><br />Proud and original member (and secret admirer) of the Pro-Mazzy movement.
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