In FSX there's sliders for AI traffic density, in fact six sliders, for "airline traffic", "general aviation", "airport vehicle", "road vehicles", "ships and ferries" and "leisure boats", range is from 0% to 100%.
In this way everyone can control how much cpu-load they will allow to be directed to handle AI, lesser system users would disable car and ship traffic altogether but keep air traffic in normal setting.
I hope SSE will use similar system.
That would be nice!!!!
Not only at sea, but the harbor also must be properly filled with vessels.