The issue of 2 causally disconnected points having similar properties I don't see as a problem. I don't see why some other point in the universe that isn't causally connected to us shouldn't have similar properties.
For example take the gravitational constant. Why should a spot that isn't causally connected to us have a different value for the gravitational constant besides your say so? My logic being that while there are points that are not causally connected to us there are points which are causally connected to us and that other spot. So if points A & C are not causally connected and B is causally connected to A & C then you can't complain that A & C have the same value for a property because since they are not causally connected "there would be no reason to be the same" but the fact that A & B are causally connected and have the same value and B & are causally connected then C can have the save value as A.
Or is my logic flawed some how?
Note the in a torus the amount of curvature averages out to zero. So there isn't a problem with saying the universe is flat even if it was a 2 torus. It would be like complaining that since there is mass in the universe and it causes curvature that the universe isn't 'Flat'
The way to think about it is the outside of the torus is sphere like, positive curvature, and the inside of the torus is saddle like, negative curvature. But if you add it all up the curvature is still zero.