I can't confirm any of your concerns, but I have an issue myself:
What if we are at war and decide to attack a unit, and our unit dies. There can be two scenarios here:
a) Preserve Random Seed is on
We could just reload the turn and decide not to attack;
b) Preserve Random Seed is off (as in our game)
We could reload and try again until our unit is succesful.
How does PTW-PBEM deal with this?