When RenderMan for Houdini is properly installed, RenderMan specific parameters are added to the Render Settings LOP under the RenderMan tab. These parameters are the same parameters found on the RenderMan ROP, with some additions (These additions are parameters that exist RenderMan but that RfH handles internally why hdprman in Solaris does not). 

You can find out more about the settings for the integrators by looking here and more about renderer options here.

By default, none of the parameters are set in USD unless specified by the control parameter whose options are:

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