The "Prepare an Environment for the run" (environmentVariables {}) section supports a "sandbox" mode for the Groovy Script.  It would be useful for the DSL plugin to allow for setting the value of this checkbox.

Use case: I (re)generate a job periodically.  The Groovy Script changes slightly over time, which makes Jenkins require in-process script approval and prevents the job from running until someone approves the script and re-launches it.  With sandbox mode, this would not happen.  (Also, it would potentially be more secure)

PR: https://github.com/jenkinsci/job-dsl-plugin/pull/1165