You are right Chris, however, the Beoport cannot be set to option 0 when connected to a Mac running Mac os X. Only option 4 and 6 and supported by BM Link.
If striker wants to run windows on his Mac Mini then he could use your trick.
The main limition is that you cannot start the hifi by its local controls... and that the Beoport and Mac need to be on all the time.
I have an Airport Express and send the music to the Aux of my Beosound, I remote control it with my iPhone and I quite happy with that solution.