Well I am not 100% sure on what the best method would be.
I think the addition of letting moderators see who is voting on what posts is a nice addition since they would tend to be closer to where the content is.
More generally I was thinking about creating a dashboard that gave the admins statistics about that user.
Similar to how we as users can see how many comments and posts any user makes, it might be useful to allow admins to see statistics about which communities the user interacts with or some rudimentary similarity score with other users?
These are some ideas I thought of on the fly and have not thought about the implications but the gist is something that allows the admins to get a better understanding of what is going on from like a bird eye’s view.