Is There a Way To Improve the Great Desert Southwest?

By changing a file which directs what and how much autogen is put where? In other words by having more bushes appear as autogen. I am using FSGenesis LC from FS9 with some success but there is still a severe lack of small bushes dotting the landscape. Since the textures are fixed right now, maybe this could be done with autogen.Anybody have any ideas? Am I making any sense?Mike