Maybe the world machine you are using is different form the one I know or maybe I simply don't know it well enough, but when I played with it I found that all you had to do was essentially connect a string of boxes, each of which represented some form of terrain generation or modification such as terracing, erosion methods, etc. Then, you, quite literally, hit a button and the world is created for you. That is why I dislike worldmachine's use, I do see it as computer generated terrain. If I am wrong than let me know, but when I dabbled in the demo version it really did seem that easy.
