It does happen, it is a known phenomenon. However, it would be cheaper, to get the added timing advance, to purchase (and make work) an AFX ECU. When you consider the cost of larger injectors, an adjustable fuel pressure regulator, and an safc, you're well beyond the price of an upgraded ecu.

However, just increasing the timing advance may not give the NA power gains you think it will. It would also be an expensive theory to test and tune.