Because the function is kewl:

v01.16.05
Fix Shoutcast issue (error 301 solved)
Improve the performance for Youtube
New: Support DTS/AC3/WMA/AAC S/PDIF setting in the Setup menu (S/PDIF RAW or PCM)

Music (OGG/FLAC Audio) is selected automatically for PCM

Released to beta-testers

Update: I got some good feedback today where some beta testers report that they cannot alter any setting in the Audio Menu and have as a result of this no output to their amplifier anymore. This kind of feedback is very very welcome !

Update 2: it’s confirmed that in some circumstances the audio options are greyed out. This is fixed in a next firmware release. A workaround for now is to reset the device to factory defaults.