How do you lock an object library? Autogen Scenery Project...

Okay I'm working on autogen wildlife for FS2004 and want to place autogen elephants in SE Asia (in the "Tropical Region"), but not show up in Central America (also located the autogen "Tropical Region")....I'm also planning on placing autogen Kangaroos in Australia but I don't want them to show up in New Zealand...Someone suggested locking the object library, and from what I've read about decomiling locked Object Libraries it sounds like if I try and go the other way this might just work....Does anyone know in short how to create an area locked object library?I'm wondering if:1. I can create a stand alone object library that locks the MDL's into certain locations (i.e. lat/lon)...or2. If I have to insert the object library into a localized BGL file in order to lock it to a certain areaMethod 1 would be preferrable to method 2 described above...