Unfilled open shifts on tradeboard?

Can unassigned shifts be posted to the tradeboard automatically?

You can post unassigned shifts to the tradeboard by adding "unassigned" shifts in your schedule week, then when you Publish that week the shifts will appear on the employee's display if you allow them to see & pickup unassigned shifts from the tradeboard or Everyone's schedule display.

There are options on the Manager's Settings>Global Employee Permissions page to allow Employees to see & pickup unassigned shifts either "At Will" (not needing approval) or "with Manager Approval" (meaning every request has to be approved by a Manager on the account).