Most clusters have the ability to submit jobs from inside other jobs. Until recently this was disabled on hex. We have now enabled this facility on the series600 nodes. You can now call qsub from inside your job script although the submission limits and criteria remain the same. The advantage here is that a supervisory job can monitor a work flow and farm out other jobs as needed, in addition there is no user delay in the process.
This capability is enabled by default on the SLURM cluster.