It is nice and all that Microsoft is pushing TLS 1.2 and AES-GCM, but they still don't have support in schannel (used by IIS and IE??) for ECDHE_RSA_AES_GCM cipher suites.
But it might be really helpful if you were to explain a specific customer scenario where the security would be meaningfully increased by adding support for this particular cipher suite. I might be able to come up with something, but it would mean more coming from a customer.