An equivalent setting at the gateway level does not exist in SY *yet*. While this is not exactly what you are after, you can use the throttle processor in any of your Camel service routes for flow control:
We have discussed adding this at the gateway level and it's under consideration for inclusion in SY 1.0.
Thanks Kieth. Very helpful response.
We started migrating this SOA-P to Switchyard. Is there an equivalent for this parameter at gateway level ?