The value returned by the 'H' symbol in the crontab is hashed off the jobname. We have a use case where multiple machines are running the same job. To make each machine have a different start time using 'H' we would have to rename the job on each server. It would be nicer to add some entropy to the hash such as a mac address or ip. This would still serve both the use case of multiple jobs on a single machine as well as one job run from multiple machines.