SC2 has a special difficulty algorithm that allows for vast decreases in difficulty per 360 blocks (~200%) but only small increases (~14%). It seems that this could be exploited by using a script that does the following:
1.) Mines SC2 when ((number of blocks / 360) % 2 == 0), that is, every other difficulty difficulty adjustment period.
2.) Mines BTC when ((number of blocks / 360) % 2 != 0). This would allow you to use your cards for BTC in the meantime.
If a large number of people use such a script, for example 90% of the miners, the difficulty will quickly drop to what it would be if only 10% of the network were mining. This would maximize return per watt for people mining SC2, yielding bitcoin when they aren't mining SC2.
