From what I can see, you can only chose one out of the 3 options , projected shadows, no projected shadows and volumetric sunlight. In my screen-capture volumetric light was not selected but there still are godrays. Also if you edit the sunlight, in the 'volumetric' tab the 'enable volumetric lighting' is not selected.
Even though the volumetric light is not selected in either of the two places, it seems to be activated automatically by chosen godrays, which is very nice. And as Chipp pointed out it also seems to work if you set volumetric lights on but do not select  god rays.

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