Comentário oficial
I couldn't find anything official, so I just put together a diagram for you following the SP1 hardware diagram for rekordbox.
See this article for the hardware diagram.
No, there is no ability to map additional controls from the SP1 to functions of the CDJ / XDJs.
Nothing on the DJS-1000 can be controlled by the SP1, nor do I believe there are any plans to accommodate it given the nature of the product.
I'll let it slide this time... 😉