I went to casinos in Berlin and Hamburg last year and didn’t see craps at all. Let’s consider rule change 3 first. My craps appendix shows the probability of winning the pass line bet as 244/495. Under the German rules it will be marginally higher. The probability of rolling a 2, 3, or 12, and then an 11 is ((1+2+1)/36)*(2/36)=1/162. So the house edge will be 1/162 less. From the craps appendix we see the normal house edge is 7/495 =~ 1.41%. The German house edge is 7/495 - 1/162 = 0.80%. The combined house edge under full double odds is 0.57%, and 0.43% when laying the odds. So clearly the US rules are favorable.