Title say almost all, but for shure I'll explain. 

Button like other two: "chek for idle fleets" and "execute planned movements", but it should check for possible battles and show it for user. 

There a lot of situations were your defender fleets stay at your grounds and blockade borders of your empire from enemy intruders. But each time before you ends turn, You need to check manually for presence of enemy forces on your worlds with battle ready fleets, and manually initiate fight & push em back. Its annoying, r'ly.