[Neil Lowe]

From what I've found so far is that the terrain is lowered and raised using the mouse wheel(roll) in 3d view. Use the right click menu to select the grid size the changes will be made over. ie 1x1 is one point at a time, 9x9 is a grid 9 points by 9 points all moved at the same time.

Hope this helps.

Cheers, Neil