The WHS Console does only provide VERY little configuration changes (add directories), nothing else (even not the Music tree). However as this version is more or less the same as the WinXP version, you can still change it "manually" by editing twonkyvision-mediaserver.ini, which you find at c:\programs\twonkyvision (that's the difference to XP). I have edited this file by copying the values I did find on my XP machine and rebooted the server - and it works!
Cheers, Kfurter