How to increase Attacks per Round beyond 5

I'm looking for a way to double the attacks per round of NPCs via the .cre files. Is there an effect or opcode I could use for this? Opcode 1 Attacks Per Round Modifier is capped at 5 attacks per round. Using haste opcodes (#16 and #317) gives you all the other bonuses of haste which I don't want (also i still want the NPCs to be able to benefit from haste and not already be flagged as hasted). So my question is, is there a clean way of doing this? I'm not opposed to using multiple opcodes or effect files if that is needed. Thanks in advance for any help on this.