I've just finished a small scenery which I'm quite please with, using photo-real textures ala Terrabuilder, a remeshed hill and even some fuel tanks thanks to Arno's FS2004 macros!I notice though that a little slice of the default coastline is left over where the edge of my photoreal image ends -- i know that I can create a single tile using Terrabuilder to remove this, but is there another way?

Have you tried making a VTP exclude? I think that should remove it as well. But this might also remove the part of the coastline that is outside of your photoreal image.