As far as the non-converging turret problem, I had an idea, though i'm not sure if its necessary now. I noticed when looking over the model, the pulse cannon mounts existed as both conventional primary mounts, as well as in the form of turrets. I thought that if you give each of the cannon turrets a field of fire that can merge at a certain distance, then the convergance could be variable and change depending on the range of the target. Then all a FREDer has to do is leave those turrets blank when selecting a player ship, or leave the primary bays blank when selecting the ship as an AI controled ship. The only downside I can see with this idea, would be the fact that the cannon turrets wouldn't necessary fire at the same time.
Later!