Enable/Disable RayTracing at runtime

Hello,
i have * r.RayTracing.EnabledOnDemand=1 & * r.RayTracing.Enable=1 enabled in my config file but r.RayTracing 0/1/2 tells me that r.RayTracing is read only :´(
Also when using “Ray Tracing Quality Switch Replace” Node it alway uses the normal input pin and not the RayTraced input pin even while having raytraced correctly enabled as shown in the documentation :´(

Cheers!