Currently there is no way on Production Preference or Production Order Type to control how Dispatch Priority defaults when creating a new Production Order.

If you want the priority to default consistently to something different - I believe this would be easily achievable through a customization of the Production Order Maintenance form.

If you need more advanced logic - perhaps your partner or someone here on the community can share their solution.

This would be a good request to log as an “Idea” for enhancement.