DJM-900 outputs / Headphone output as a separate output in Ableton?

I know there are 8 outputs you can control when using the USB connection to a computer (Ableton) 

But my question is if it is possible also to use the headphone output as a separate output? I'm just wondering because I'm running Ableton and want to send out more than 8. Let's say 10. Hope this makes sense!

Hope you can help me out! 

Michael