If I were a sysadmin, I'm not sure I'd want no quota on userid BATCH.
But it shouldn't be too hard for a sysadmin to set up a number of userid's (BATCH1, BATCH2, ...) each with a quota that would not be reduced by concurrent disk usage by other userid's. Let the op system dynamically allocated batch userid's to batch submissions, so users don't have to choose.
Of course, you'd still be at risk of multiple simultaneous demands for disk space exceeding overall disk availability. But at least you'd avoid the synthetic disk shortage created by sharing a quota well short of actual disk space.
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