In other words you would prefer a threshhold of say 25 for spec > diffuse in Blender rather than zero, or perhaps a level that can be set in the exporter ui by slider. I think this would be easy enough to do. Best put a request in Lionels recent thread asking about stuff for the next version. I guess you should test hardess as well. No doubt in the future Octane will have more shader types too so it might be handy to sort out a convenient conversion strategy. The zero now is a bit inconvenient I agree.
i7-3820 @4.3Ghz | 24gb | Win7pro-64
GTS 250 display + 2 x GTX 780 cuda| driver 331.65