IIRC in EB there was a plundering trait that Sweboz (and possibly others) got, which amounted to some mnai for devastating non-friendly squares, was that right?
A "Piracy" bonus might work the same way for being at sea or in a coastal province, tro simulate the character sponsoring suiccesful priate raids. However I can't imagine the amount of scripting it would take to make that income be subtracted from othe peoples trade (which is after all where it would come from). So it'd be a "gamey" solution rather than an intergrated global feature AFAIK.
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