Passing this info along for any that might be looking at a Razer keyboard. I bought a Huntsman V2 KVM (great keyboard for $100) but found it would not work in the HID ports, works fine in the USB 3 ports. (in future revisions please put a second USB 3 port on the back)
Contacted Razer and they told me they INTENTIONALLY do not make many of their devices HID compliant. Not sure on the why for that but there it is.
Good news is my Basilisk X Hyperspeed works just fine on HID.