Has anyone figured out why/what the purpose of the "favorite" button for the songs are? (the one below the cover art - not the favorite station button) Using Slacker on the web, "favorite"ing an individual song would allow you to build a custom station with all your favorite tracks. But unless you login with your own account info, and we can't get access to the Tesla special account via the web for our cars, there doesn't seem to be a purpose for this button. I haven't found a "favorite songs" station in the menus in the car (there is a custom stations menu, but it's blank?). Why did they give us a button that we can't effectively use?