Reply to Pioneer DJM 800/900 Send/Return

Hello

I was wondering something, is it possible to use he Return channel on DJM 800/900 as an 5th "channel" just like the xone:92?
And do I need to select the Send/Return effect to get audio through? So I can't use the effects unit while doing this.

I want to do this so I can hook up the Return channel of Ableton to the return of the DJM but not using the Send outputs since I'll be sending audio out of Traktor to Ableton.

Thanks,
Duros