I've just been trying using those beautiful red SRP chain ring bolts for two months. Had to tighten them every like 30 miles. Don't know whether it was because of singlespeed use. Lost one of five and overwinded (Can you say that?) two others and finally dediced to go back to using ordinary steel bolts.
Anyways - I would neva-eva use aluminium crank bolts! not even after mounting the cranks with steel bolts...