The smartest thing I can say about this method is that it composed of low house edge bets. Yes, a 12 will lose the move wager and push the don’t move on the come out roll, this is where the home edge is. By making the cross bet you’re growing the general home edge. So my recommendation is to stay to just the don’t pass and laying odds. However when you don’t lose on the come out roll the don’t cross guess will often win. In your instance you’ll lose one unit for every 12 on the come out roll. While you often win laying the chances, you must danger more.