Priority of the prod jobs will be defined as per their criticality of the cycle. If the job is running in High critical cycle then it will be defined while scheduling itself. If you want Bump up the priority of the job, you can keep them BATCH HOT (CA - 7)mode so that it will take high priority. User submitted jobs are altogether different. It will depends on CLASS and other JOB parameters. Please let me know whether i have understood your question properly or not.