#3. "RE: metering multiple areas without moving focus question" In response to In response to 0
I would just shoot the scene with matrix metering selected. Then evaluate the picture by looking at the histogram on the display. You could also look at the blinkies of the picture on the display. If the exposure needs adjustment, then use positive or negative exposure compensation to fine tune the exposure and re-shoot the scene.
I think you will find in many cases the camera will do just fine.