SLX-D was added as it was a matter of adding new device IDs to the existing control protocol for Shure (and testing of course). The protocol Sennheiser use for EW-DX however is fundamentally different to what we implemented for the 300/500 and 2000 series, and was in the process of changing again as we were developing V2.1. We are in contact with Sennheiser and have the documentation we need, so rest assured EW-DX is high on our list.