I agree, it is a bit disappointing. Actually, the whole subject of Hyper-V and Open-e is a disappointment. I started using Open-e solutions several years ago as it was/is a very cost effective storage solution. And as Hyper-V is also extremely cost effective (free for Windows users) the two products would seem to be a very good match.
However, there does not seem to be any emphasis from Open-e on Microsoft's virtual servers. For example, searching the Webcasts and Videos section on the Open-e web site lists twelve titles with "VMware", three with "Xen" and zero with "Hyper-V" in the title.
Don't get me wrong, I'm not bashing DSS, it's a fantastic product; I just wish there was more effort put in to Hyper-V support/functionality.