More Calendar Date options

The Calendar needs more display durations options then just Full Duration and End Date.  Start Date would be really nice to have, as well as the ability to display based on a Date Custom field.   As an example, I have an item that is Event Info.  The event has a date range, but there is also a set up date and on site support duration.  If I want to have a calendar with these three dates, currently I need to break them info three separate tasks, which is extraneous.  For some events we only need to know the date it starts on, and not the full duration.  To display this in the calendar, I need to set the "end date" of the task to the start date of the event which is confusing.  There are many other instances where limiting the display duration is frustrating and I just end up not using the Wrike Calendars.