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As far as I can figure it's all about the relative activity of the O2 either side of the sensor, since it's biased between exhaust gas oxygen and atmospheric oxygen. By pulling the O2 into a cooler exhaust flow it may under estimate the amount of O2 present. It will depend on where your O2 sensor is located and the flow at that point in the exhaust system. On the outside of a bend you might not be able to pull it back enough to make a difference, in a turbulent flow, you might not be able to pull it back enough. There will be a fine line between getting the exhaust side a little cooler and cooling it enough so it doesn't work... in which case you're running rich in open loop or holding startup open loop sooner.
My preferred method would be to increase the activity on the backside of the sensor by keeping it as hot as possible, shrouding the backside against the exhaust pipe so all the air it sees is superheated and the O2 is more active. Vehicles with an O2 sensor in front of the motor may see a benefit from grille blocking due to stopping airflow cooling the O2 sensor backside and getting more warm air around it.
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I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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hockeyadc 
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