Take a look at Aura.Data.RegionInfos, I think you should be able to get the prop information from there. It's basically information about all regions, areas, props, and events. The behaviors weren't designed to keep references to client side props, but to implement behavior, for which we needed a reference, to know where the prop is, for security checks.

This should probably be changed, now that we do have information about all client side props. We could add the props to our entity lists in WorldManager on start, but make sure that only server sided props are sent to the client. When we have all props in there we have no need for the behavior list anymore.