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Most computer controlled cars have ECU-driven electronic actuators (like stepper motors or solenoids) to control idle. If you've got a stepper, simply unplug it when it's in a position you like. If it's a solenoid, you may have to rig up throttle bypass hoses to get the idle speed you want.
I can't lower my idle below 900 because it will oscillate wildly due to the bouncing of the air to fuel mixture. There are significant fuel savings to be had by lowering the idle. It helps at stops, engine-on P&G and neutral coasting. It's easier to do on some cars than others.
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