Separation planes for remash

It annoys all of us that two parts that are not supposed to connect (like fingers) connect when you remash the geometry, there are several ways to solve it, but they are all unnecessarily complicated. How about an option to use planes to mark separation (or any other type of geometry, but I think it would work best with planes). Let's say that when doing a remash there will be an option to select a "separation collection" in which there will be all the objects that separate, then Blender will know where geometry should not go where the objects are.