I started really messin' with Customizer last evening as a friend wanted some theme customization done. Its actually pretty slick.

The only thing bugged me is the inline stylesheet so I have it writing into a CSS file instead that is last in the priority enqueue. He's throwin me a few bucks to fix it all up. The theme (I wont mention which) was from TF, last week I did a few things for him. But I ran source output html through the W3C HTML validator, 1347 errors. Its down to 412 now.

Towards this end, dunno if Customizer core be interested. I am kickin around XML for all the customizer field definitions .vs. its array based mechanism.