Re: heroes
two crossbows (or four) wouldn't be an advantage because it takes one whole body to reload and cock them. If you had two of them you'd spend twice as long getting them both ready to fire again (probably longer, since you'd have to prepare one, set it aside, prepare the other, pick them both up, aim them...). Also, since cocking a crossbow is done by the whole body, having four arms wouldn't help with that at all.
Finally, since there is no known vertebrate with more than four limbs, it is safe to assume that four arms would not, in fact, evolve to be useful.
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