A question on Non-Rev travel and companion pass traveling:

The system is really confusing to me. I am trying to do some non-rev traveling with friends on a companion pass internationally. How can I get out of a city w/o NW service? I can jumpseat but can I get an ID-90 or ZED fare for my friends going on the companion pass? Why can't I list for all the NW flights on the schedule? Any that say 'AIR' are operated by other carriers and can't be listed on? Can I list for KLM flights? Its turning out not to be as easy as I had expected. Its free guess I can't complain too much.

Also, if I don't know what flight I want to come home on when I am in another country, how can I list for the ride home? Thanks for any help anyone can provide.