If other universe contain all logical possibilities, then yes. David Lewis talks about this and points out the moral issue is that even if you choose to do good things in this universe, in some universe your alternate is a psychopathic torturer, so decisions to do good don't actually lessen universal suffering, if calculated across all alternate universes. I think his conclusion was that it's still desirable to locally decrease suffering anyway.
The gods are sandboxed, so unless they've discovered an escalation vulnerability in the multiverse substrate, they can execute any permutation of possible behavior but never affect the lower layer. If that happens, it's back to "turtles all the way down" as we then try to figure out what's running the multiverse VM.
