i am NOT playing SP in disco, because thats impossible.
to play freelancer without disco, just make a backupfolder of your settings (..../username/documents/my games/freelancer/) so the folder is empty and freelancer can create its own files.
these are the only files that get altered, all other filed get copied out of freelancer into the disco-installpath and then get altered.
but thats not the point: in freelancer you have to deactivate the cockpit, because it disrupts the text when in cockpit view.