HDRP pathtracing indirect multiplier does nothing & pathtracing hangs before reaching iteration coun
You are right that it’s not supported.
In a way, it wouldn’t be impossible to make it work.
However, it’s probably not what we want because in the pathtracer, every bounce after the first is considered indirect, so not only indirect diffuse contribution will be multiplied, but also specular (as in reflection) will also be brighter and it might end up as either making a choice on what is considered indirect or making a more confusing results for users…
That makes sense. Might want to add this explanation as a conditional info box when pathtracer is on 
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