Currently an individual assignment grade posting policy can only be set when an assignment has been published. The default grade posting policy for both a course and assignment is automatic. If the default post policy is not amended or is intentionally set to automatic, any grades and feedback will be immediately when assignments are created. If this is not intended another step into the assignment creation/publishing workflow is required and the risk of grades and feedback being released prematurely increases.
What would be ideal would be that an assignment post policy setting is added to the assignment settings.