This is a WD user forum, not one that they use for direct dialogue with users (aside from stuff that gets escalated by the Moderators when a support ticket is required, which is basically the route you already went by).
But no, it is not currently possible to access an MCM’s shares directly via the site, only via the apps you already got pointed to. For the MCM the WD2Go site is basically just the stepping-stone route so that the app knows where to find the MCM if your IP address isn’t fixed (as is the case for most home users). It is a feature that has been requested by users - see here for an example of such request.
It is something that many people want, but whether it’s technically feasible or possible may be another question entirely on the current set-up that they have.
