Right ok I think perhaps I was confused.
By Face AF and Eye AF you guys aren't talking about a setting in menu since there aren't any for that. Ypu're talking about assigning a Custom button to e.g. C3 to Eye AF or Face AF right?
In the menu we have:
Cog - menu 3 - eye-start af (this is different from Eye AF)
Cog - menu 5 - Face registration (this is different from face detection AF)
Think I'm clear now.