Well if you think about it if everything is corrected setup with Roles you don’t really need tracks to organize into stereo pairs by clip type.
When you export you can choose to group each Role into a stereo pair on export. Meanwhile it stays as discrete clips within the timeline. In every other NLE it’s necessary to enforce organization by track at all times. In X, you can leave this until the moment of export. Here’s how you’d set that up:
https://support.apple.com/kb/PH17904?viewlocale=en_US
Noah
FCPWORKS – FCPX Workflow
Call Box Training