This is edit mod. It included blocks for coping, pasting, deleting, and filling 3D areas.
A word of warning--exercise caution when using this mod. All this mods operations are permanent so make sure you know what you are doing.
It would be a good idea to do some tests before using it for anything "real." For usage information see "directions.html."
Download: https://github.com/MrRar/edit/archive/master.zip