Option to use Internet metadata and artwork only when no local data is present

Any chance that under Metadata Retrieval Settings: Video: Get text metadata and artwork from internet web sites we could have a sub-option only attributes and artwork that would otherwise be empty?

I can’t tell you how many times I’ve added files, selected them, selected Maintain Files..., ensured Only update new files or files with empty attibutes is checked, changed the Metadata Retrieval Settings to include Get text metadata and artwork from internet web sites, updated the files... then forgotten to go back to the global Metadata Retrieval Settings to turn off Get text metadata and artwork from internet web sites and had the metadata and/or artwork I already chose and incorporated into the next file I added overwritten.

Thanks for the suggestion. We'll discuss it here for possible inclusion into a future version of Mezzmo.