If I remember correctly, you can do anythin with SEIV mapeditor. Choose the places where players start, make wormholes, planets, suns, nebulas... everything. you can find the mapeditor at the same location where is SE4.exe. It is called SE4Map.exe.
Good luck for making good scenarios
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If you give a man a fish, he will eat a day;
But if you teach a man to fish, he will buy an ugly hat;
And if you talk about a fish to a starving man, then you're a consultant