Easy New Way To Exclude AutoGen in FSX!

Today I was messing around with the Object Placement Tool and discovered that that "Gen_SceneryEffect" is a simple way to exclude Autogen (except for addons). Simply place it over the area you want to exclude and convert it to BGL format and add it to your AddOn Scenery's "Scenery" folder. The only downside to this is that I haven't yet discovered how to adjust the size of the excluded area. I tried changing it by adjusting the scale of the "object" but it didn't work for me. If you discover how to successfully change the size. I'm sorry if this has already been discovered, I know I asked this question a few months ago and no one seemed to know what it was.