I tend to set up my main camera with the viewpoint and framing I want (and then save that position to avoid mistakes) and then do my work with the directors camera. I can then easily switch back and forth as the scene progresses. You can also save several viewpoints for the main camera and even switch the viewpoint of the cameras between directors and camera1. This is all in the camera dropdown in the upper right of the 3d view. The interface may not be to everyone's taste but it will usually get you there. Ed