I'm still learning alot about this program and I'm trying to find some plugins that allow me to place foliage on the terrain.
Basically I can adjust nearly every aspect of the world I create. What size diameter the planet is so that the program can calculate the curvature of the surface that would result. I can modfiy the terrain however I want to, be it color or whatnot. The water is also completely customizable. It's really a damn cool proggie.