This is exactly why I went the hardware route.

Even if they get after hardware boxers, then you simply bind 5 (or in my case, 6) keys next to each other on the XKeys, and just roll over them with my fingers. That will cast them at different times then. Nothing to "detect", and they're not "sync"ed. I still don't think it gives someone an unfair advantage. At least not from my perspective. I multibox in DAOC and an equally numbered group will roll me any day that's played by 6 indivudual people.