Shortcut to drag and duplicate a task in calendar

I have a lot of the same type of tasks on my calendar, which I often have to copy exactly in the calendar. Now if I highlight a task in the calendar with the left mouse button and move it to another day, it just moves. It would be very convenient if the same action with the Ctrl button pressed would not move the task, but copy it, leaving the old (original) task in its place. Similar to moving/copying cells in Excel.