Both stuff already happens and is possible, provided you have the latest Plus! Live version.
Go to your Event Viewer and click the Options menu, there you can select the kind of events which should be shown (granted you can't select individual events like signins, status changes, etc... but if you want to track something like that you could also always click the "Event Description" column header to sort on it).
POP3 notifications are also listed in the Event Viewer, as long as you configured a POP3 account to be checked of course.
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