What you have done is correct. You do not necessarily want to restrict time slice to much as that will cause unnecessary paging. You want to give it a higher Run Priority Number. Say 99. It will still use all unused CPU but release the CPU if some other job needs it. Running a system at high CPU but sub-second response time is good use of resources. Batch jobs should have the lowest priority, (highest run priority number), that any server or interactive jobs. If this is a special known long running job, you can even put it behind normal batch jobs.
Remember it does tie up a subsystem entry. So you subsystem must allow enough jobs and you job queue entry must allow enough jobs, else you wonder why other jobs are stuck on queue.
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