[Feature Request] Height level randomizer/auto tool

[CCTiberius]

So the request is for a tool that works much like the terrain auto-generator, but for height levels. So as with the terrain you would mark an area, and the tool would make random craters and hills in the ground in that area. I imagine a tool that randomizes the ground between +1 and -1, and one that randomizes between +2 and -2 height.