Oh, it's a part of ProUI, I though it was a different plugin. If this is mainly for UI controls, then I guess my questions are irrelevant.
I've bought it, it's actually really good at what you wanted it to do. It's sort of like Prefabs.
The author mainly uses it for UI, but besides some limitations with other behaviors like physics and some platforming issues, there's nothing really stopping you from using it to compose objects!