Ctrl + drag-and-drop to reschedule only the current instance of a recurring task
Would be cool to have an option for changing the start date (or maybe even the duration?) of a single occurrence of a repeating task.
Holding Ctrl while dragging the task itself (maybe limited to only the current day, in order to avoid weird recurrence edge cases) would reschedule the current instance, while keeping the future tasks unaffected.
As a bonus, holding Ctrl while dragging the edge of a task to change its duration, would only affect the current occurrence of the repeating task too.
Edit: it is possible to reschedule only the current instance of an event by changing its "start at" time, but leaving its rule unchanged. For anyone wondering, the "rule" of a repeating task is what appears when you open the task detalis and click on the text describing the recurrence (for example "every day").
My suggestion would be nice to have as handy calendar, mouse-only option.