I believe this is the Settings API referred to: http://codex.wordpress.org/Settings_API
Mike, I’d love to see the icon field when you’re ready – are you using FontAwesome by chance?
I’ll echo the suggestion for creating custom field types – it’s actually much simpler than initially seems. In my opinion, ACF development (i.e. Elliot) should focus on improving core rather than adding new features which would likely not be used by all (though I am not trying to direct Elliot’s efforts, nor am I discounting the suggestions above). The image radio field is an interesting idea though.
