Dundradal said:
The turrets on the bow of the Tarawa were manned because they were stripped from a kilrathi orbital base and welded onto the bow of the ship. They had to be manned because they weren't tied into the ships targeting computer (so it appears).
And from what we've seen, only point defense turrets are normally computer-controlled. What made things special with Denniken's modifications in False Colors was that he tied all the point defense AND the main turrets to computer control, so they could all be used to hose down the drydock and the Vorghath.
In Fleet Action, we see Bear ordering 'all weapons fire independently and at will' in the Battle of Hellhole, then he later orders all weapons to concentrate on a frigate, so the turrets can concentrate fire on a frigate as they pass. If this was all computer controlled, I doubt he'd need to make orders like this: instead, like in False Colors, he could just order the weapons officer to concentrate their turret-fire on a specific target.
Furthermore, in that same novel, they go out of their way to state that Denniken's special project was to modify the 'largely automated point defense lasers' - they specificaly state that the point-defense systems are automated, or mostly automated. In other words, most weapons on ship are human-controlled... and as illustrated in the WC4 Novel, computer-controlled turrets aren't much good at killing things save missiles or other relatively predictable targets. Whether the humans are inside, such as the juryrigged front turret Tarawa had, or else just inside the ship controlling the guns (which may be the case, since in Fleet Action they do mention how some damage from the Battle of Hellhole included some of their mass-driver gun mounts being destroyed) is immaterial - they're human-controlled, to a large degree, on at least several different ships we've seen. We also know that Venture-class corvettes like the Johnny Green also used humans to man the turrets. Three or four different classes of ships here have been shown to have human-controlled gun systems, so I'd say it's fairly safe to hypothesize that both Humans and Kilrathi tend to prefer organic intelligences controlling offensive weaponry, for both reasons of flexibility (a human or Kilrathi can do more than just man a gun) and the skill a gunner can bring.