In VBP its possible to define user defined actions by creating a custom COM component or a custom script.
I need to create an user defined action which is iterative, which means it has to call child steps in an iterative manner like the "process files" built in action does.
I can't figure out how to do this and Google isn't helpful either.
Found the answer myself on the kinook forums:
Its not possible to define an iterative user-defined action, but its possible to use a workaround by defining a conditional build rule in the loop controlling step.