I have v4 and m4 and the other figures that I use regularly in the base runtime  and all of my most commonly used props and poses.  Since I save characters with clothing and hair I dont often need to use those so they are in an external runtime. Buildings and vehicles and other major props are in a third runtime.  

I usually reduce the file patyh for props, poses and figures to remove the vendor folder and group them as buildings / vehicles / scene fillers etc.