I cannot change setting of PostParametersLimit

I have tried using the documented approach of adding the parameter to Neo-runtime.xml (the param was not in the file at all, I added it) and by createObject("component","cfide.adminapi.runtime").setRuntimeProperty ("postParametersLimit", 120) (we successfully use this to set PostSizeLimit)

I have this problem in CF9.0.0 and CF 9.0.2