5D3 manual focus confirmation question

[aroo]

I'm just getting used to a new 5D3. During manual focus in automatic AF point selection mode, the center point is the only one that will confirm focus. The instruction manual indicates that's normal. Is this the end of the story, or is there any way to use all 61 glorious AF points to assist manual focus? This behavior strikes me as strange, since most other bodies put all AF points to use in the same scenario, and the 5D3 has such a robust AF system otherwise. Any thoughts or tips? Thanks!