My newest extension and sequel to my previous extension is out: Presenting Naninovel Scene Assistant! It lets you easily modify Naninovel objects in real time and copy their corresponding command and values with a single click. You can also copy multiple object values at once, useful for setting up complex scenes.
Video guide: https://www.youtube.com/watch?v=Qc5XYE-ojx8
Github page: https://github.com/idaocracy/NaninovelSceneAssistant