I read about a rider who had his drain plug come out while on the highway. Although I do use a torque wrench to tighten the plug to the specified 16.5 ft. lb., I decided to safety wire the drain plug like I used to do on my race bikes for extra security.
I was about to start drilling when I noticed that the oil pan casting has a conveniently-located rib that is close to the hex head of the drain plug. I had an appropriately-sized screw type hose clamp so I put it on the drain plug hex head, rotated it into the best position, and tightened it. The hose clamp is very securely attached to the hex head of the drain plug. It will not allow the plug to rotate out because, if the drain plug did start to loosen, the screw housing on the clamp would come into contact with the rib on the oil pan casting, thereby preventing further counter clockwise rotation and holding the drain plug in place.
This probably would not satify tech inspectors for track days but I think it provides a nice back up and a little extra security. Also, it is easy and the price is right.