Hi Snurrebassen,
When it comes to landscapes it’s best practice to set up your size from start and leave it. Scaling and rotating can sometime have odd effects. (Ex. Texture stretching, LOD issues, etc.) Not to mention if you place any foliage it doesn’t scale correctly with the landscape. If you set the landscape up correctly from the beginning there isn’t really a need to scale it.
If you have anymore questions just let us know.
Thanks, TJ