Is there a way to directly display the different qualities of the tiles (color coded system tiles for terraforming)?
So, based on the quality of the tile, a different colored hex is displayed.
Not as far as I know. There's this line
<PlanetSurfaceTerraformUsableBorderColor>PlanetSurfaceTerraformUsableBorderColor</PlanetSurfaceTerraformUsableBorderColor>
in /Galactic Civilizations III/data/Core/GalCiv3GraphicsDefs.xml, but there's no entry for differing levels of terraforming quality.
I'd also try looking in that file to see if the other variables for tile borders can do the spacing thing you wanted.