Not quite true. Any dealership that wishes to continue to stay in Ford's good graces, and enjoy various sales kickbacks, CPO certification, and other incentives, must meet minimum customer approval levels. Get enough pissed off customers, and your approval rating starts to suffer. Get it low enough, and it can actually make a pretty hefty dent in the bottom line.
That's good to know there is some control, although I fear that only comes into play in extreme cases. I wish Ford had more control given it's their name that gets tarnished. Franchise laws are so outdated.