Render Stats
The Arnold render stats flags for each Golaem asset are inherited from the Crowd Render Proxy attributes. You can override them on a per mesh basis in the Character Maker through Renderer Attributes or using Arnold Operators.
Creation
Within Arnold, render stats are all merged as an flag based integer value called visibility. To check the resulting value or disabling / enabling specific render stats, the easiest is to apply them to a Maya mesh and use the .ass exporter to check the resulting value. Then you can set this value, on a per mesh basis, using the Renderer Attributes:
Example: disable the Casts Shadows visibility flag
Casts Shadows enabled / disabled
For more information on each visibility flag, check this Arnold documentation page.