Well, i guess that, for future releases/versions, an Import option for the Editor would be precisely one of "Commercial Marine Traffic" and another of "Commercial Air Traffic", with options ranging from "restricted/daunting" to "dense".
Left appart the possibility of randomly positioning the plattforms along their plotted courses, such courses (the MAIN ones) are pretty standard, as are the types of ships which use those routes/courses.
For instance: Developpers would just need to add the OCEANIC LINES(for ships).These are pretty much condensed in relatively few known and optimised routes from BIG Hub-Port to another along which big cargoes circulate back and forth . Those lines are the ones exploited by MSC, Schenker/DB and other big freight companies, which rent/hire the normally big ships to the owners of the vessels.
Of course, besides that, there are the "FEEDER-Ships" which, usually navigating along the coast and making lots of escales/stops in less important ports make short-range distribution, but mostly collect cargoes to take them to the BIG Hub-Ports referred above (Antwerp, Rotterdam, Qindao, NY, etc.). Those FEEDER-ships are obviously smaller and less important targets militarily speaking. Therefore, the small trawlers, fishing boats, etc. would not need be included in that addition, and it would be up to the users to position and plotting the courses of those minor plattforms for any specific scenario.
Similary, this could apply to commercial air-traffic, randomly generated between all MAJOR civil airports.