Actually, even more useful for me than triggering off stars is to allow setting the context when the task is created via IFTTT. I can set tags via IFTTT recipe, it would be useful to set context as well.
Then I could populate context from specific iOS reminder lists.
Ok, so I realized it is only helpful to add tasks to google calendar, if they have a due date. Right now every task adds to my calendar when I create it. That doesn't work for me. I think I need a "New task with due date" trigger?