Basically, the idea would be to assign fields of fire to weapons, restricing them to certain directions based on weapon type, placement and possibly special weapon mounts. It would add an element of strategy in placing weapons in the ship designer. Also, battles would be more interesting to watch, as ships maneuver to bring weapons to bear, or avoid enemy fire. Ships would have a maneuverability rating based on hull size, with some tech based modifiers like "inertial dampeners" of StarTrek yore.
Perhaps this may not be realistic considering the programming challenges to implement such an idea, but would certainly add a lot to the game.