As the title suggests, it would be nice to have a TerrainHeightChanged event handler that gets triggered whenever terrain height changes due to the setTerrainHeight command. The event handler could provide an array of arrays in format [[position, newHeight, previousHeight], [position, newHeight, previousHeight], ...] or whatever is deemed practical.

Usage? People who frequently manipulate terrain or are building any kind of system that involves a terrain matrix for whatever they need one for, that being an extension in my case.