Being a brand new OMD E-M5 owner, I am in the process of trying to learn how to use this camera efficiently. I have the Olympus battery grip which makes the camera much easier for me to hold and use. My question concerns the dial on the horizontal or landscape part of the grip. It is in a very convenient spot for me and I was wondering if it can be set to act as a main control dial? This would allow me to easily control aperture or shutter speed depending on the mode.