Jas,
I am not sure if you would get enough flow of water through the engine with the bypass pipe blocked off. Any flow you get through a small hole in the thermostat will be through the radiator and cooling the water.
I know the zetec's like to run the oil a bit hotter to get it thin and lubricate better, but you have got to get the balance of correct cooling verus overheating right to prolong the life of the engine.
Cheers
Dave
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