Yeah, the car mode would have to be activated.. If it's an app, then just activate the app..
Why not have a dumbed down interface though? Let's say you want to turn your GPS on while driving, the ideal way is to have a big icon on your screen taking you there rather than having to look for it.. And while you're driving you're pretty much limited to GPS, music player, phone app and I can't think of anything else right now...
The idea is that it would provide a car mode for those apps as well- big playback and GPS buttons..
Ah well, maybe it's not that necessary after all, I was just wondering if it's doable, and if so, is it worth doing.. Same goes for the alarm clock thing.