Allow configuration to restrict document upload by all staff

Please add a config item similar to "Restrict process creation to only PMs, BAs and PCs (Default: Off)" - ie make it "Restrict document creation to only PMs, BAs and PCs (Default: Off)"

Why would we want all general staff able to upload any document they like into what's effectively a quality management system? Yes I understand that there may be document approval features (which I have to check) but we would prefer to not even have the "Upload Document" button sitting there, begging users to clog the document management system with whatever they feel like uploading.