Overwrite existing scenery upon pasting/move tool

[shplim]

I'm essentially trying to move an entire continent along the Y axis by 10 tiles, however the copy and paste scenery functions don't necessarily seem to be enough.

When pasting over existing scenery, it simply includes all the scenery that's already there as well. Is there/can there be a way to delete the existing scenery when pasting over it?

Also, I wonder if there may be a better way to copy the underlying landscape as well. When copying, it seems to only copy the landscape above a certain level. I'd love to be able to copy the entire x,y,z chunk I'm selecting. Or, perhaps being able to move an entire chunk of tiles in a certain direction