Landclass "Adjustment" - Ground2k v2.0

Is there a way to fine tune landclass to perhaps make one a higher priority than its neighbors thus causing it to be predominate. I have just one little area at the end of a runway that is crops. If however, I make the landclass that is encroaching on my desired cool grass (42) then I loose a small populated area which is desireable. I have looked at adding fixed textures but they look terrible with their perfect borders when compared to tne normal blended textures.Dick