Flatten Brush on Landscapes

Are they ever going to make it so you can have clean edges without a slope using flatten brush? I realize the landscaping tools were made for sculpting country sides, and that the tangents are causing it to slope, but if someone wanted a straight up and down edge it wouldn’t matter if it got stretched, so why not have a tick box that allows us to stretch the tangents. Has anyone built a plugin for this? It would be easier to cover stretched materials on a flat edge with a wall, than it would be to have to rebuild the landscape in 3DS.

You can fix this if you cut a fine hole in the landscape with the Vanish tool and a hole material, then put a wall there covering the hole.