I can add turrets but it will be only an extra work. Also if someone is not using "this" turret at this slot it will be even more weird. You can consider most turrets to be "deployable" or something like that (when being offline to be inside the ship). But they will not move, nor shoot. This is game mechanic and I can't do anything to change it.
I know what you had in mind about this but it can't be done in FL. Not yet, until someone actually program it.
Also, most ships in game don't have any turrets near their bridges so even if such mechanic was in game only very few would benefit to watch their cannons rotating and firing. But even if that happens how can you fire at your rear and sides without "leaving" this view? It's complicated.
What I've tested so far with few ships is that the shots come from where they are supposed to because I am using the actual size of the "ship" in front of you. For example the valor (check post 15 image) can fire pretty accurate with the forward gun and it's shot is going out exactly from it's intended location.
Need feedback about this: "Should I remove the middle metal window separator"? Few people already told me that on skype but I would like to hear some opinions here as well. Its absolutely no problem to delete it - just say if you find it useless or if its fine.