Well, I thought I'd hop on the bandwagon and throw an airport in the Arkansas hole, but I can't seem to get the exclusion area to work.  As I understand it, the coordinates describe two opposite corners of a box and that area is excluded.  Unfortunately, the autogen trees are all over the place.  It seems to have excluded some, but not all.  Here are my entries into the scenery .cfg:

[Area.008]
Title=Central North America
Local=Scenery\NAMC
Layer=8
Active=TRUE
Required=FALSE
Remote=
Exclude=N33 46.22,W93 57.92,N33 45.41,W93 56.94,objects

Any ideas?  ???

I should have mentioned, I had worked it out.  Thanks for the reply...