The plugin already has Job DSL support for configuring scm. However, in order to add a publisher, I need to do something like the following in Job DSL:

configure { project ->
project / publishers << 'net.praqma.hudson.notifier.CCUCMNotifier' {
}
}

The help text for the ClearCase UCM Post-build Action states that if the plugin is selected, the post build action is required.
In that case, it would be nice if it could be created in Job DSL without using the configure block.