Yesterday I noticed what I thought was a suspicious voting pattern on a question. I flagged the question for moderator attention and noticed that most of the set of downvotes on the question (all but one had been downvoted) disappeared. Presumably this is because a moderator intervened, but it could also be because a strategic downvoter was simply successful and got their vote changed for most questions just under the wire.
In cases such as this -- where a moderator takes an action in response to a flag or declines to take such an action in response to a flag -- it would be nice to get some feedback to that effect. If I sent an email to the SO team, I get a response. It would be nice if a moderator could add a one sentence notification a la the badge/new response notifications that I would see at some point when navigating the site.
Note: it need not be a custom message. A simple: "A moderator has reviewed and accepted/declined your request" would be sufficient though more info would be appreciated.