Yes, X11 is a composite of 11 algos, but the hardware is designed to give you the result after running through all those algos.  You can't just tell the hardware to stop in the middle of computing and give you the results for a specific algo. ASIC's usually are optimized and made very efficient at doing 1 specific function, in this case x11.  To add or do only a specific algo requires not only a firmware change, but now also a hardware change.