Marvin,
WB tends not to micromanage. Just look at the output from Eastwood, Nolan, Snyder, and Ritche.
But, and as a fan of the studio, there's been a slight disturbing trend at WB in the last two years. Clash of the Titans, Terminator Salvation, and now Green Lantern are victims of the studios butting in. WB didn't use to do that a few years ago. That's why it has gotten the reputation of being one of the best if not the best studio for director's. They're very director friendly over there.
But, I can't deny the troubling signs in the last two years, especially with those three films I've mention.