Pike: "Observer" or "read-only" admin access?

Hi, all. Beginning to roll out a newer-than-what-we-had OpenStack release -- likely to be Pike, "For reasons." (Which is still *worlds* newer than Juno, where we are.) And I've been asked if there's such a thing as an account (or ACL) that allows a user to read everything, but write nothing. Googling, I see mention of such things -- but nothing really firm. Does it exist? Is it in Pike (or more recent releases)? If it doesn't exist, is there a graceful way to make it happen, anyway? Thanks! -Ken