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It seems a bit strange. Why manually insert each tree when you can customize a brush? What's so difficult about that... Besides, there aren't many good standard brushes, only about 5-6 out of the whole list, so it's better to create your own brushes. Just a humble comment.
I haven't seen the editor for the fourth game in a few years, but I think it refers to the GSC. That is, you can take maps from GSC and heavily modify them, but you can't just submit such maps in their unchanged form.