How to configured e-m5 auto focus for family pictures with moving people in side frame

Background: I normally use the camera with smallest single point in the middle. I then aim 1/2 click and move camera for proper framing. This works fine for 'static' objects but is not very good for spontaneous pictures of folks who are moving about where the framing is likely to not have the subject in the center. I do have eye detect on and from the manual it sounds like I want to enlarge the middle point to be the full screen but not really sure. Unfortunately I left limited time for testing so suggestion/advice would help...