Determined that automatic typing doesn't work 100%, removed it.

If you're trying to add a value that doesn't already exist in the
config source or which doesn't have a schema entry present,
such as /apps/gdm/simple-greeter/banner_message_text, then the
type can't be found automatically. Best to make the user specify
the type themselves, since they'd have to do it anyway when
running gconftool-2 by hand.

Also took out --direct - our config guide had it in there for
some reason but it was just creating unnecessary headaches here.