I would think that an aircraft with the abilities to take off from ports might add an interesting dynamic to the game...especially a pby because it really would not be very good otherwise.
It would and most of us would like to see it. The debate is not about that, it is about which one it should be and while the PBY is very important historically, it is also, of the three most commonly mentioned, the least capable. The Sunderland and H8K2 are also historically significant, so we're not talking about comparing the P-39 with the P-63 here.