In reply to Peter.

Ha, ha. Ok. Understand this then. WordPress provides the noose so that clients can hang themselves with it. Then when they do, the site is down because of a botched edit. Now this the noose is going to be that much more alluring. Bad idea.

Who gets to fix it or get the frantic calls? Not the client. Disabling it in the config can prevent it all from going to heck and then since it's disabled, these new features will never be see or used. Total waste of core dev team time IMO.

For those that still want to use it and know how to enable it, it should require editing of the php config file.