Script for changing the placement mode for buildings.

Building_PlacementMode_AssetEditor.cs

var asset = ToolsModifierControl.toolController.m_editPrefabInfo as BuildingInfo;
// Possible placement modes:
// Roadside
// Shoreline
// OnWater
// OnGround
// OnSurface
// OnTerrain
// ShorelineOrGround
// PathsideOrGround
asset.m_placementMode = BuildingInfo.PlacementMode.Roadside;