Saving volume settings and auto transmit option for linux airfoilspeakers

I'm using airfoilspeakers on linux (ubuntu 8.04). Streaming works very well from Airfoil (Windows). My problem: I can't save volume settings and auto transmit for the linux "device". As I can see in the Airfoil registry settings, linux airfoilspeakers uses a different (randomly generated?) device ID everytime it is started. This leads to Airfoil always recognizing the device as new, setting the volume to zero and ignoring an enabled auto transmit option. As a side effect, Airfoil fills it's registry settings with numerous useless volume settings and auto transmit ID's for devices, that will never appear again.

My question: Why doesn't linux airfoilspeakers use the mac address of the machine it is running for identification, as the windows version does? The MAC doesn't change and volume and auto transmit setting could be saved.