As requested in the forum, I am reposting this issue as a ticket.
It would be handy when importing thousands of records to use the Import>Data ca_objects mappings & data spreadsheets to import image files or media representations of an object. I see this as locating a batch of original media or image files somewhere on the server, perhaps the import folder, and then using that location in the cell of the data spreadsheet. It would be best if them the file is imported and processed into its various sizes.
I have successfully used the Import>Media dialogue many times, however, we are importing up to 10,0000 item records over the next few months, and I think it would be much easier to fill out that info on a ca_objects data and mapping spreadsheet if possible.