I think we should leave Vienna until it contradicts massively to the DWU. It's early days yet, there may be crossovers etc that the folks at Big finish hadn't come up with yet. Of course authorial intent matters, but only really in situations which contradicts the source material.
I would like to point out this is nothing like the Faction Paradox situation, as that was an explicit reaction to The Ancestor Cell, which used code names for things within the DWU so copyright would not be infringed.