A better Symmetry Object for C4D please

Symmetry is rather selective in what it is mirroring. E.g. visible lights are ignored.
Please let Symmetry do what it promises, or let Cinema 4D warn if it does not.

And another issue:
When a Symmetry Object is made editable, I would expect two mirrored objects, but Symmetry combines the geometry an hierarchy to a useless result.