Job Board using the existing 'date open' and 'date closed' to update the publish & unpublish status of the entry
Link the job board 'date open' and 'date closed' fields to the publish / unpublish date (cron job?) so that jobs are automatically added and removed from the list.
That's a good idea: it would automatically use the current date to filter out closed jobs entries.
We're going to be adding field configurations, and that's a good one to have.