Valid point, and IMO a programming error. It's obvious to use the 'set' button to return to centre point yet it cannot be assigned to this function in the custom menu. But don't despair, I already requested this being done by Magic Lantern, if one of the devs doesn't implement it I'll add "center af on SET" myself to ml as it's such an annoyance
Quoting myself: I've just added "Center AF on SET" to Magic Lantern myself :-) ... it'll be in the nightly builds sooner or later. Take that Nikon, I can program my dslr to do what I like, no dynamic range can beat that.
Also you can now navigate in an alternative, imho better way with the multicontroller, it doesn't go to "all af points" anymore and you can get from middle to the extreme corners with fewer clicks.