When calling AutowedgeCells(region) - or when using explosions,
terrain should be smoothed on lower surfaces as well.
As it stands, being underneath or inside large pieces of terrain (for example, if someone wants to make a cave, or tunnels with the terrain feature) it doesn't look nearly as nice as it does from above.
http://wiki.roblox.com/index.php/AutowedgeCells_(Method)http://wiki.roblox.com/index.php/AutowedgeCell_(Method)http://wiki.roblox.com/index.php/RBX.lua.Terrain_(Object)
I literally would be willing to write the code for this. It shouldn't be hard to implement, and would be a huge bound in the versatility of terrain.
This feature should absolutely be implemented if rumors that a tunnel-making terrain tool is going to be created for the standard toolbar.