Although we're already talking about this in the beta forum, it might be an interesting thing to discuss here too, if you're not reading the beta forum..

Namely, when the new version of WED opens up an fbx file to turn into an MDL-only level, it should also get the standard WED entity properties if they are also included in the fbx file as custom attributes. So if, in Maya, XSI, what have you, if you made a text attribute called Behavior, or a boolean one marked Transparent, the FBX level import would recognize and automatically assign those values to the entities as needed.