I have heard of none. I generally don't have too many windows for 1 app open, and cmd+` to wrap through them normally does the job. I know this isn't much help, but cursory searching turned up nothing like this.
option+cmd+m will minimize all of an apps windows at once, so then you'd have them in the dock, but I know this isn't the functionality you are looking for.
Good luck on finding a real solution to this, but I am afraid this isn't (easily, at least) achievable.
-Lee