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The amount of power generated by a diesel is due to the amount of fuel burned. As long as enough air is present to burn the fuel charge, that's the power you will get. The turbo packs in more air to burn more fuel and get more power, so it's a feature that works during high power demand.
To run the turbo with out being in a high output mode would mean you are doing a lot of extra work to compress the air for the same power output. This adds up to a loss of efficiency. Plus if you screw with the controls and not know exactly how the engine management will react, you risk grave damage to your car.
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