(dons Helmet, kevlar vest and cup.) Biwiring Cornwall IVs any benefit?

No benefits. Bi-wiring is just a ploy to get you to buy more wire. Bi-amping using an electronic crossover and another amp to drive the woofer separately from the mid/tweeter is beneficial as it offers better control/damping of the woofer.

Bi-amping removes the inductor and capacitor from the woofer and connects it directly to a separate amp connected to an electronic crossover.