OK, here's another idea for an experiment to reduce vandalism and make edit patrolling easier - require users that aren't logged in to enter something into the comment field. Encourage these editors in text next to the comment field to describe their change and explain where they got the information from. Tell them that unverifiable information will be deleted.
Sure, some will put "blah" in there or some other nonsense, but that'll show up in recent changes and it'll draw attention. Some will outright lie about what they're doing (putting "fix spelling" when they're really deleting text or whatever), but this will be obvious to anyone viewing the diff. It won't stop vandalism, but it'll make it easier to detect.
Feel free to comment on this experiment proposal.