Client want read/write access to all authenticated domain users on table in database .
Explain to them the potential problems with complying with such a request. There are good reasons for denying access to all underlying tables and granting permissions to views and stored procedures. What does this person expect to gain by doing this? Screwed up data? Personally, I think such a thing is a recipe for disaster. If they insist, make sure you have a really good backup system working, because I bet you will need it.