Certain functions must be either implemented manually, through and API call or by running a task on a set schedule.
The ability to run the task based on a form submission or Zapier triggered event would be very valuable, especially to users who are not familiar with making API calls or in situations where doing so might expose the API key to the public.
This feature would also help in situations where the # of form rules for different situations becomes too much for Knack to handle, causing errors.