Pilou,
Unfortunately "save file" at several moments is not so functional like Parametric Tree or Timline.
You can not go back and modify some features, you can not disable feature, you can not go back at some moment and create some feature in the past.
With Save you will confuse very fast if you want to use it like Parametric tree.
Any way Save is the only Parametric alternative now for MoI :)