I'd like to see a ship that has angled guns that face slightly upward or downward- this would give that ship an advantage at different altitudes, not just distances and direction.
Probably faced upwards, though, because a balloon-popper with that angle could be insane.
I'd also like to see biplanes available... or something that acts like an even quicker and weaker version of the Squid. How about a plane-like ship that doesn't have a balloon, but it can't go in reverse or come to a stop? The hull is very weak, and it only has two light-guns, one facing forward and backward. One engine, that, if destroyed, acts as the balloon and makes the plane lose altitude.
It would also be a very cozy ship.