If you replace your OEM drain plug with a plug that uses a different sealing device (o-ring vs crush washer), I hope you have the background fastener knowledge to ensure that this new plug won't be more likely to back out from vibration and simultaneously oil your rear tire AND cook your motor.
Personally, I do not, so I would be reluctant to install such a different fastener than OEM, especially on such a crucial, oil sealing application. Maybe a machinist will weigh in?
Personally, I like to safety wire my oil drain plugs. It's probably overkill for a streetbike, but it is easy to do, and there must be SOME reason that roadracing clubs require it...