I would like to see a way to partially execute a workflow (specifically for an App) for the purposes of allowing user to make selections based on a dynamic data flow.
Ex:
1. Database Selection Interface
Click Next
2. Select from available columns to pass through to the output file.
Click Next
3. Pick from selected fields which fields should be pivoted.
Output file and complete run time
This was a simple example to explain a case, but the most common use I could see is for APIs.