Apple's FrontRow and DAC question

Much to my dismay, I learned that Apple's Leopard (OSX 10.5) does not allow FrontRow to utilize AirTunes. What this means is that when I play music via FrontRow using Apple Remote, the sound *only* plays through the computer speakers, and does not flow wirelessly to AirPort Express. Until Apple fixes this (used to be available in Tiger), I can only use iTunes.

My question is whether using an external DAC via Toslink or USB is a workaround for this. i.e. does FrontRow send digital signals via Toslink or USB? I don't have a stand-alone DAC to test this feature so any help would be much appreciated.