Yes just look at the ship in binoculars, put the crosshair on it, and hit spacebar. That will man the gun and they'll start firing.
As for unmanning it, once the ship is destroyed the morale should be high by then and you can then unman it with F5. But if moreale isn't high enough you can always just hit R (surface the boat) and they'll unman the gun. I know that doesn't make sense to use R but it works none the less.
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"Chance favors the prepared mind"
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