A new Featurerequest: The normal magnet tool combined with perlin noise. I've seen that in a video of the far cry 2 editor. You create a mountain and at the same time the mountain get's a natural look because of the perlin noise distortion. => the perlin noise is not used on the whole terrain but only on the place where you do something with this magnet-noise tool.

I hope you understand what I mean.

Additionally a vegetation tool would be cool. It's like painting on the terrain, but instead of color, random plants are placed.