Make sure you follow me on twitter! @DarkDiaMiner IF I post a mod download it and give me a +1 if you appreciate.
Make sure you give me a suggestion at my WIP topic darkPE
Make sure you click on that +1 button if I help you! ---------------->
Use an iron hoe, click on a block and things will happen, check the commands for more details.
edit: For what I know the tool you want is "selection rectangle": click on two blocks and it will create a 3d rectangle
the command to use the tool is:
/voxel tool 2
Yeah, I figured out how to do it before you responded, but I had to go to bed before, I had the chance to log on! But can you add a command that tells the item ID of the block your holding, and also when you tap a blick with a hoe, it says "Block selected!" Or maybe a little icon to make it look less rebundant!
Thats really a great mod for map creators and I am going to use it from now on for terraforming in my maps!
I really hope that you are gonna add the erosion feature as well and maybe even a draw function like in MCEdit.