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Sorry, won't work on modern OBD engines. The O2 sensor checks your air/fuel ratio and will correct it. Plus, 5-10 degree difference will do next to nothing as far as fuel trim.
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That's correct. Racers do the resistor mod because they race at WOT, which is open loop mode. Your IAT is ignored in closed loop operation where fuel is concerned. This mod is worthless, so don't waste your time.
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Thats also not to mention that a lean burning engine emits more NOx emissions which is nasty stuff. Factory equipped lean burn engines have a special catalytic converter to deal with this.
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Worst case scenario is about 25% more NOX emissions than at stock levels. Leaner than a certain point, and they get lower again. Hydrocarbons also drop when leaning out, so the tradeoff in pollutants is not worth fretting over.
Also, don't try resistors or offsets on a narrowband O2 sensor. It's essentially a digital device.