No, it's set by the ECU. If you have an idle problem, try cleaning the nozzles, checking vacuum lines, boost leaks, air in the fuel, clogged fuel filter.
Don't forget, a diesel has no throttle. When you press on the gas pedal, it controls the injection pump and the injection pump gives it more fuel. It also tries to smooth out the idle. If you get a vag-com, you can take a log and see if the injectors are being controlled evenly. Not sure why you want a higher idle.
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