We were looking at using the feature to archive artifacts in our Openstack Swift (we might use more JCloud features in the future but that's not on our road map) but it's not possible to use BlobStorePublisher because it doesn't implement SimpleBuildStep. I think that's probably the only thing that you can't use JClouds for in Pipeline without writing a complicated Jenkinsfile?
I'm not familiar enough with the API to be certain, but I think just marking BlobStorePublisher as implementing that interface would make it usable in pipeline without any other work being required.
I use jcloud plugin in pipeline. What exactly do you propose?