Decoherence and the Objective Reality of Numbers

Given that the laws of QM give way to the macroscopic laws, what escape is there from determinism?

More importantly, how does macroscopic regularity fall out of QM at all?

Is it possible for PI, e or i to have different values in different universes? On the surface, it seems that natural constants -- those the usual subject of talk of the anthropic principle -- can be twiddled from universe to universe; is there something special about these mathematical objects that make them invariant regardless of the knobs are tuned?