well yes, your right, in GWX 1.03 it does happen, i have had a deck gunner get killed because of it but i was less than a boat lenght to the target though.
But if you run across a merchant loaded with TNT wouldnt the lethal blast radius would be slightly longer than a boat length but i dont know i have never blown up a ship before hahaha
honestly im happy with it the way it is.