Adding an option to choose to split objects on import

[Westu7]

Is your feature request related to a problem? Please describe.

In the current version, objects in the place marked as shade flat after import are split into separate instances.

Describe the solution you'd like

Have an option added during import in what form the refractions should appear on the object. Whether they should be separated into separate instances or become a single solid object with shade flat markings on the edges.