Determines whether entities contained in map entities are to be placed into the level, or not.
THIS IS ONLY A GUESS!!!
But From my understanding, I think this is to tell the engine to place any sub_entities within a map entity to be used or not.
so if set to 1 I believe you are utilizing any entities in the compiled map (map entity) with models to be used, or 0 to ignore them....
I dont think ent_create needs to be used for this. Rather this variable needs to be set before loading your level....
