Glad to know I'm not the only one, I couldn't for the life of my figure out how to seek through the standard list of radio stations with the wheel controls. I had the same experience, it would only go through my favorites.
Manually pressing the next button on the main screen isn't very convenient as it's a stretch and being a touch screen I can't leave my finger on it and "press" for the next station, I have to fully remove my finger which means I have to look over (or poke blindly) to get the next station.
This seems like it would be an easy fix, I hope they resolve it soon.