I think the reason they don't officially support it is that most of the content you'd use this for is illegal. For now at least.
Trip,
You're so kind with B&O.
It is obvious that they don't support video because the BS5 is not well-finished and moreover is a strategic error : when they started to develop the BS5 they didn't saw the Audio/Video convergence. So they designed an Audio only product. Meanwhile the competitors were in the process of integrating Audio and Video in the same device.
Moreover the BS5 was mandatory for B&O in order to stay in the race. After 3 years of R&D the product was not realy terminated but they sold it because they absolutely need it from a financial point of view.
I'm waiting for MK III (at least) to buy it, when it will have the (basic) functions I'm looking for.