forget multi exposure points, focus wheels.. in reality, the lens just focusses in one plane. For most wedding stuff (this is a personal preference) I shoot with a single focus point. I can focus, lock and recompose faster than my camera can track.
The issue with weddings is that often you are NOT focussing on what is in the middle of the frame (that is often behind the B&G), also a lot of the time you are not focussing on the closest object in the frame
This photography lark is easier when you strip the layers of crap out
- You have several major controls - Aperture, shutter speed, ISO. Assuming you want a clean shot, lets ignore ISO, that leaves aperture and shutter speed. forget all other modes on your camera. essentially this means you only need to learn to use M, A & S. the rest are distractions
- your camera has a meter. It might have 100's of them, however, forgetting all the marketing hype, all this electronic jigger pokery does just one thing - figures out what exposure is needed for the one shot... So you just need to figure out when to spot meter, and when to meter the whole scene, or something in-between
- Eventually, you will need to learn to add and control light. Now you can let your camera do it for you, or you can learn to be creative. Read the strobist website. Again all the electronic jigger pokery comes down to several things - how much light are we bunging out, and can we nail the exposure at the same time. What the camera doesn't know is "how you want the shot to look", which is why you MUST learn to control flash yourself, and then learn when to give your camera the task of making the decisions for you
- composition and producing a great pic is about seeing and having vision, and understanding what you can do