I too believe this is a necessity. But please don't limit it to one common shared folder that forces everything to be funneled through it. I have no practical use for that, and I imagine no one else does either.
It would be great to be able to share any folder and that folder show up in the users list. For example, my girlfriend and I have about 20,000 photos between us, and growing rapidly, however we don't need to share them all. I would love to be able to create a "Mexico" folder, or a "Wyoming" folder for us to pool our photos.
I've enjoyed the simplicity of the unit, as I did look at beefier options, I just though they were over kill and wrongly assumed this device would handle such a simple task.
I also have one more request that I will create a separate topic for. It pertains to syncing from the D:.