We seem to think in similar tracks! I do have the exact features you describe already. Each BOM that I add can then be searched for and its parts deducted in batches (of for example 25 times the amount of parts are needed per module).

And a BOM can be imported from a csv file exported from a Digikey/mouser shopping cart. Although now that you mention it, re-stocking from such a csv would be a really nice addition.