Be able to set a condition on a Flow that sends an alert via email or notification that the Flow has failed. This would be an instant notification just like the Flow Throttle Warning email that gets sent. The same format as the current weekly Flow failure report would be great but there are some Flows that are to complex to put in alert actions due to the number of points where it could fail and the Flow is for a process that is too important to wait for a weekly notice that it failed.
This alert would a global setting for an individual Flow similar to the ability to turn a Flow on or off now but with additional fields that allows for a custom message and "users to notify" to be entered. That could ever just be an ability to leverage an existing Action that is triggered if the Flow fails.