I use multiple runtimes, loaded as needed. I've got one for each figure I use often (V3, M3, David, Miki, MilKids, Aiko, etc.). I also have a runtime just for hair (since hair can be used with any figure). I've got a "fantasy" runtime, for fantasy props, sets, etc. Also SF, Horror, contemporary. And a "nature" runtime (for plants, trees, rocks, and other outdoorsy stuff). I've got a "toon" runtime, for toonish items, and an "animals" runtime for realistic animals, a "special" runtime for things that are rarely used (such as holiday items). And a Sixus1 runtime, because his style is so distinctive it doesn't mix well with other stuff.