This would be like runbook specific variables, but they are defined on the runbook and don't make sense to be in the published snapshot. They would generally be prompted values, but that shouldn't be required. They would be "snapshotted" when you run the runbook. When you are scheduling runbooks with a trigger, you should be able to provide values to use when the runbook is triggered.

For an example use of these, we have a Runbook that exports data from a database to a CSV and emails it. We have variables for the from and to dates and the email addresses to send to. These are variables that are specific to this runbook and have no meaning outside of this runbook, so polute the variable page.