90 degree landscape tool

This probably was suggested before…

Imagine you want to make a hole in the ground for a building cellar, currently you can make something viable but on the surface you are left with some kind of slope and its a tedious process, you have to then cover op the slope with some mesh. A 90 degree landscape tool to cut precisely would help a lot when adjusting the map for your architecture.

Lets further streamline landscape modulation
Lets take the landscape tool to the next gen level …
Consider the possibilities (Minecraft style as well)

Thanks

Yeah voxel based terrain, for caves etc.
But another good tool should be an plane subdivided BSP model where you can model with a brush like the Landscape tool.