"How would this work on a normal head unit?"

In general (but not necessarily in this case) I don't think this is the right approach. The empeg-car is not just another head unit. It is capable of far more than the average head unit. Some design decisions for head units are limited by their lack of capability and are therefore not optimal.

This question should also be asked in regards to all other functions, such as Random, which I consider "broken" because it doesn't work like it does on a regular headunit.

I also consider random to be "broken" but not for the reason you describe. Unfortunately, the way a CD multichanger does random is rather difficult due to the way the empeg-car does caching etc. I will try and investigate further.

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Mike Crowe
I may not be speaking on behalf of empeg above :-)