Sorry for the delay and thanks for the question.
Yes, right click is supported. You can test it here:
http://www.daypilot.org/sandbox/Calendar/EventCreating.aspx
Two scenarios are supported:
- Just right-click somewhere and a context menu appears.
- Select a time range by dragging a mouse over a free time block (just like in Outlook). The selection becomes active and you can right-click it.