So here's how to make a custom map using WW2Map's "IMPORT" feature.
Go find where you want to make a map of in Google Earth, and draw a line measurement tool about 50m to help you get the pixel scaling.
Proceed to do some calculations:
In photoshop or paint shop pro, draw on a second layer various features of interest.
For the Terrain Import feature of WW2 Map:
Color Triplets R, G, B combined gets you a specific color.
GREEN = amount above 155 is the % of tree coverage.
RED = Amount above 155 is % of roughness?
Here's the Import Map attached to this post.
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To use the import feature:
LOAD MAP -> CLRWW2v3.DAT (loads blank SPCAMO map)
TOOLS -> import from bitmap
load bmp (load your bitmap with stuff laid out)
Set the conversion scale to (10, 10) pixels/hex
Push TER CONVERT
Close import window.
Save your map.
Copy your map into the SPCAMO MBT Maps directory and load it in the map editor.
I need to do some editing, but this allows you to lay out the general "area" of a map quickly and accurately, without having to "hex count".