There are some users whom I wish to give access to products, but whom I do not wish to be able to manually reduce stock quantites, either on the product page itself or on the Bulk Inventory Update page.

Even in the case of warehouse staff, who regularly do stock-takes, I would like to have the option of blocking their ability to manually reduce a quantity.

An advanced feature would be to have any stock amendments by certain users (additions or subtractions) having to be 'approved' by an admin user...