rw decal

I have rw decal and I used bilxstr. When I went to google earth and downloaded the files etc I got it all to work but have a few questions. The terrain looks good but will it show cuts and fills where bridges are? The data I put in looks pretty close can you change the resolution or the distance like you can in rw decal? And using rw decal How do you keep them from moving when you are working on top of them. And as always thank you. 
