Mavlink routing on Arduplane for relay configuration

Hi,

Is there any parameter that can be set to stop a relay UAV from broadcasting its telemetry via Mavlink but still enable it to perform MAVLink routing (routing from the GCS to the payload uav and vice versa).

I know its possible to configure the GCS system ID to ignore telemetry from the relay UAV but the GCS needs to listen for all broadcast. So the requirement is only for the relay UAV to stop broadcasting MAVLink telemetry as it will be controlled via a RC transmitter.