You are absolutely wrong about the extra oil not helping with contamination. There is a reason Mercedez uses 8 quarts of synthetic in a v6 motor and the oil change interval is between 11000 and 15000. Part of it is sythetic oil and part of it is the volume of oil used.
Second, I don't need a graph. If you have ever heard of conduction that explains it plane and simple. I couldn't say if this would make a big difference. You are provably right, I would be willing to bet it is a fairly negligable difference.
As far as the oil taking longer to heat up, big deal. You shouldn't be beating your engine up until its started to warm up anyways.
As far as a thermostatic setup to control flow through the oil cooler, if it isn't setup to keep the oil at a proper temp, why have it at all ?