I am playing a giant map which size is over 30mb,so it needs some time to load/start the map,if the game can choose pause when start,then when the game is loading i can do another thing,i don't want the game running when i am away from keyboard.
You mean to start the game in pause mode?
That would be my assumption, as he mentions creating a new map and wandering away from the computer... :)
In that case, perhaps if you push P key while loading..
This works, just press p when the loading screen start.