System Manager 2.0 does add vfiler support, but unfortunately it is the same features as FilerView (create, delete, stop/start), so no GUI into the vFiler.
The good news for CIFS shares is the Windows MMC works and most of our customers use it (for both physical controllers and vFilers). You can connect to the vFiler from the MMC and modify shares like a native windows server.
Re: When can we see improvements to vFiler management
It isn't in System Manager 2.2 or 3.0... it was in a beta at one time and on road maps but unfortunately never made the product... Product Management will need to answer, but it looks like it won't make it into the product (MY Opinion) this late into 7-mode.