I would find the ability to adjust real time rates individually for Ground vs Air extremely useful. I think this would apply to most vendors. A "global" discount per carrier does not work for us. We subsidize our ground rates by about 30% in North America. We cannot subsidize priority and air shipments which could easily cost us more than the value of the entire shipment. In order to get around this limitation we are currently forced to use 2 carriers on our websites One carrier has only ground shipments enabled with adjusted discount rate while the other has only air services enabled at our cost. It would be much better for our customers and the look of our websites if we could offer the full range of shipping options per carrier.
Thank you for considering this enhancement.