Other Settings
There are a number of options under the button 
in the Terrain Inspector.
All additional Terrain Settings
Base Terrain
| Pixel Error | Amount of allowable errors in the display of Terrain Geometry. This is essentially a LOD setting. |
| Base Map Dist. | The distance that Terrain Textures will be displayed in high-resolution. |
| Cast Shadows | Should terrain cast shadows? |
Tree & Detail Settings
| Draw | If enabled, all trees, grass, and detail meshes will be drawn. |
| Detail Distance | Distance from the camera that details will stop being displayed. |
| Tree Distance | Distance from the camera that trees will stop being displayed. The higher this is, the further-distance trees can be seen. |
| Billboard Start | Distance from the camera that trees will start appearing as Billboards instead of Meshes. |
| Fade Length | Total distance delta that trees will use to transition from Billboard orientation to Mesh orientation. |
| Max Mesh Trees | Total number of allowed mesh trees to be capped in the Terrain. |
Wind Settings
| Speed | The speed that wind blows through grass. |
| Size | The areas of grass that are affected by wind all at once. |
| Bending | Amount that grass will bend due to wind. |
| Grass Tint | Overall tint amount for all Grass and Detail Meshes. |