This is addressed directly in the first section of the README:
> By default, job ids are per-directory, but you can set $NQDIR to put them elsewhere. Creating nq wrappers setting $NQDIR to provide different queues for different purposes is encouraged.
> By default, job ids are per-directory, but you can set $NQDIR to put them elsewhere. Creating nq wrappers setting $NQDIR to provide different queues for different purposes is encouraged.