Basic Support for WS-Addressing
The current support for SOAP-based services is good enough for some scenarios. However, one that I see missing that would make integrating WCF-based services easier would be to support basic WS-Addressing.
In particular, if the API is implemented in WCF using WSHttpBinding with only transport security, it will be exactly the same as a regular BasicHttpBinding-based service with SOAP 1.2, except it will also require the WS-Addressing <To> and <Action> headers.
For now, we've managed to make it work in SOAP-to-REST scenarios by manually inserting the WS-Addressing headers into the set-body template, but this can be very annoying for complex services.
Supporting this out-of-the-box would be really nice.