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#1 Operators separated by spacelike intervals commute. But you
cannot correctly jump to the conclusion that they can't influence each
other . This is incorrect application of general theorem in presence of
entanglement. For details see de la Torre et-al Found Phys. Letters 4,
no1 p.49 (1991) "Nonseparability and noncommutativity in quantum
systems".

Schrodinger was the first to realize that Heisenberg uncertainty
incompatibility can exist for commuting operators (as well as
noncommuting operators - the familiar case) in presence of
entanglement (Berliner Berichte 296 1930). In other words, the
quantum connection is in itself a causality violating communication
channel in which measurements of commuting observables can
influence each other.

All the proofs forbidding superluminal and backwards in time
communication within standard quantum mechanics (e.g., Eberhard &
Ross LBL24984) are mathematically incorrect confusing a necessary
condition for a sufficient condition.

The results of Kip Thorne et-al quoted in my Physics Essays 4, 3 Sept
1991 (University Toronto Press) show how to avoid causal paradoxes.
Feynman amplitudes for time travel paradoxes vanish.

#2
Details can be found on the well in science conferences 156 and 274 or
contact me or mitsu email well if you are interested.

Basically

[|v1>|v2> + |h1>|h2>]/sqrt2 -> [|v1>e^iphi(2) + |h1>]|v2>/sqrt2

This is unitary. Local probabilities are conserved.

p(v2) = 1,    p(h2) = 0

p(v1) = 1/2,    p(h1) = 1/2

To get superluminal causality violating communication within
standard QM rotate one calcite relative to other by 45 degrees
If local receiver basis is |+>, |-> then

p(+1) = [1 - cos{phi(2)}]/2    and    p(-2) = [1 + cos{phi(2)}]/2

This is unitary -local probability is conserved.

If we do general rotation theta between calcites then

p(-1) - p(+1) = sin{theta(12)} cos{phi(2)}

which violates parity. Causality violation implies parity violation.