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As Twisted said, the manual switch is there just in case the automatic lights do not operate. The automatic lights are controlled by a modue. If that module fails, an owner needs to be able to turn the lamps on. Daytime running lights, and automatic lights are a safety feature that makes it easier for others to see your car. Have you ever noticed that durring different parts of the day, mainly morning and dusk, that you missed seeing a car until it was much closer? That is part of the reason for these automatic lights. I am not sure about other makes, but the GM models from about 2000 and newer have a selection on the manual switch to turn off the automatic lights. You have to do this every time you start the vehicle, but atleast then you have the option. Also the switch, if moved to the "running light" position, will turn off the main headlamps.
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"It is not that I have failed, but that I have found 10,000 ways that it DOESN'T work!" --Thomas Edison
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