Newbee problems ! deck gun and ships in port

[FooFighters]

Hi guys,

I am still a newbee in this game. Maybe you can help me ?
I have 3 questions.

1 st. When I engage an enemy ship my deckcrew starts shooting on it with the deck gun. I have not given the order to do that.
How can I stop this.. is pretty annoying and it takes the surprise away.

2 nd. Is it possible to have only docked ships in the harbour.
I know about harbour traffic but that is to heavy for my machine.

3. When I save after a patrol. And end the game. My new mission is always in Grid AM19. if I go to the harbour and start a new mission without ending the game. I do get a new grid.
What's happening here ?

Thanks....