It would be great if there was a tool that could let you scale grounds in the map editor. What I mean by scaling is basically being able to drag the corners/edges of the ground and make them go outwards or inwards to make the ground take up a different amount of space. There will be an option to turn it on and off so that it can be less of a problem when you're trying to click on grounds near it. An alignment tool will also be provided that will stop your ground from being scaled when it meets another ground's edge or a landmark axis but there will be an option to turn it off, hence it may get a bit annoying when you don't need it. While scaling, you will still able to move the ground simply by dragging it.

Benifits

1. Instead of experimenting the length and width of the ground to make it take up a specific amount of space you want, you can just use the scaling tool and make the edges exceed to where you want it.
2. The alignment tool will prevent accidental ground overlapping.

Photos

Not the best to represent what I'm suggesting but close enough.