Map Editor Question

I am trying to get the game to add planets in systems I added manually. I created a map with just four systems and the game always crashed giving lots of errors after I exited to windows and it closed. Finally I got a message about out of memory and had to reboot. I then fiddled with the game a while, then decided to give it one more try. The game generated just fine! It turns out that you can not have both the map editor and the game open at the same time. I do not know if that is a bug or a feature. I am posting to bring this old thread up because I was wrong. If the game has noplace else to give a empire start, then it will create in any system regardless of whether it is standard or not. I guess I just got lucky generating map6 with a 1/254 chance of hitting that system.