This would support scenarios where different "configurations" of a pipeline cannot share the same Jenkinsfile.
If I had multiple Jenkinsfiles... repository github.com/apple/swift
I would like to create multibranch Pipelines for each so I have the resulting structure:
Note that in this example I have an organization folder for github.com/apple and it is creating multiple multibranch pipelines for each Jenkinsfile discovered in each repository.
I have written up examples and use cases in this doc