The only experiance that I have with a "random" Start stage was not very good. Picture this, 4 ports with one each hearts, diamonds, clubs, spades. A deck of cards on the table which was centered on the wall about 15 feet away. Which ever card you drew was the port you started out on. We were the second squad through. shuffled the cards after every shooter. Half way through the match, some squads were placing the card of the window that they WANTED to shoot on top. And yes I got a window in the middle of the array!
Ivan