Ahmet, I think your head is going to explode!
Also, don't forget about modifying the signal from the air temp. sensor in the MAF. All of your points are valid, and many are used on the latest generation of the Camaro/Firebirds. Moving the air inlet temp to a cooler location gets you a few HP. "Tricking" the computer into running in the open loop will make it run richer also making more power. This is done with a special engine temp sensor, and a 160 degree thermostat. Like you said, the computer never thinks the car warms up.
I think the biggest benefit would be from adapting a hot wire MAF to the system, instead of the more restrictive barn door AFM. If someone can do it for the 951, it CAN be done for the N/A cars as well. Unfortunately, there's not much market for a MAF system for the N/A 944.
Do you have the Bosch Fuel Injection & Engine Management book by Charles O. Probst, SAE ? It says that if a large adjustment is made to any one sensor (by an adjustable switch as you say), the DME will ignore any changes made to that sensor, and ignore it, running the engine in a "limp" mode with preset values to only keep the engine running, but not at it's optimum. A better idea would be to figure out the resistance of the temp sensor when cold, and wire a resistor in series to give the same value when hot.
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