Another Deck Gun question.

[Telemon]

When I wish to engage with the deck gun I man the deck gun by 'draging and dropping' crew members to its location. However if, whilst engaging the ememy I leave the gun to go to the bridge for a look round, or any other position for that matter, reloading of the gun stops until I return to the gun position. That being the case what's the point of 'manning' the gun in the first place?