Me neither 
The only way I managed to do that was by activating Transmission āblack holeā feature and using that in CouchPotato.
It is not efficient. We need to fork and rework these apps entirely to have the feature available directly.
This falls under the project āmultimedia appsā: Choix dāun dossier multimĆ©dia
I donāt have much time to work on it at the moment. Maniack Crudelis did most of the work on this specification. I wanted to apply it by reworking the couchpotato package first
Cheers