y2k

Hi All, Is there a way to prevent sysprep from removing a key from the RunOnce hive in the registry? I know that I could just put it in [GuiRunOnce] but because of the image deployment software we're using, we can't do that (complicated to explaing, we're using custom build software). So, I need to find a way of making sysprep not remove this key, is there anyway at all to do that?