Lightroom Classic: Rename on Import (Add mode - leaving files in place, just renaming them)

I'd really like the 'Rename' function added as an option to the Import (Add) screen.  It's available for all the other options (Copy as DNG, Copy, Move), but not 'Add'..  

Just because we leave the files in the folder they're already placed in doesn't mean that we don't need to rename them while importing them to the Lightroom catalogue.  

I'd like to be able to just do a straightforward rename on import using and keep existing extension etc, as it will enable me to strip spaces from existing filenames very easily, saving me having to manually rename them before publishing them to certain publishing services (at least one of my publishing services replaces spaces in filenames with underscores, which then means the filename on the service doesn't match the filename in my catalogue..  

Renaming on import will eradicate that problem so the filenames will be legal before even adding to the pubishing service.

It's a dead simple feature request, since it already exists in every other import mode.

Thanks.