This is a minor quality-of-life improvement, but one that I - and hopefully others - would find immensely useful. I would like to request the addition of a visual indicator in the main calendar view if an event is a recurring one (Outlook does this with a circular double-arrow symbol). If one instance of a recurring event is altered, that symbol becomes crossed-out, but remains visible as to distinguish between recurring events, altered recurring event entries, and single events.