Hmmm I am not sure of how you would go about doing what you want to using Geomip. Me personally I use L3DT bundysoft.com/L3DT/ it has a free version. It has a terrain sculptor and painter. I export my terrain from there as a collada file, I load that into blender,
use the decimate modifier to lower the poly count then convert the triangles into quads “Edit Mode Alt + J” and smooth it with the “Smooth Vertex” button. And apply the Texture, Normap Map, Light Map, Spec Map, Shadow Map" in the materials panel and export it to egg.
This is in panda
Here is a scene with the same terrain but its fall
