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It will depend on the vehicle and technology available, but EGR is generally switched off at cold ambient conditions because of the increased likelihood of misfire. So, my thought (not tested I should add) would be to trick the ECU into thinking its operating at low ambient temperature. Since the IATS generally works on a resistance basis, it should be possible to adjust this feedback.
I don't have more info than that at the moment, but if you have a scan tool and can see both EGR and IAT, you should be able to find out at what temperature this happens and using a multimeter measure the sensor response to temperature as a resistance. If you can then supply an adjustment to this resistance, making the engine think it's at cold ambient, then it will turn off EGR and I expect, advance the timing.
As I say, not tried it but think this may be easier than sending dummy MAF signals.
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