Headphone Mono split on controller

I have a DDJ SX.  And I have been a fan of Pioneer Mixers[ie 600/800 etc] for many years.  One of the main features that has been extremely useful for me is the Headphone mono split option.

Will this feature ever be installed in a controller?  When I first received the SX I noticed it appears in the software, but it is not enabled.  Thank you.