Ah.... so you simply tell it to add a forest at a single vertex.... will try that tomorrow...even more data for FS2 to digest...
And for any other polygons you create for cultivation: Key = Building
Value = Industrial
Key = building
Value = Residential
To add height to buildings:
1. view the centroid lat & long in JOSM (click on polygon, this highlights it) then go to view settings, Advanced View.
2. open you .toc file and find the lat & long - then just set the building level.