I think you can only disable it for the side mounted camera key, not for the on-screen shutter button. I don't know if it is meant to be like that, but that's how my one works. The setting is in the camera settings under - More - Camera Key Settings
What about RTFM page 88? There currently is no way to disable the burst mode in the camera settings. The option that you are referring to is no exception. Tizer already mentioned that workaround. I do not wish to make a photo using the physical button. It's not usable for making "vertical" photo's and because it's not a soft press button, its not ideal to get the best composition.
