What if a patron had the option to have a SINGLE notice per day, that was a digest of all notices to them?  So, if they have this option checked, they would get a notice at the end of the day, or beginning, that would contain any hold, overdue, predue, etc notices.

So, if this is checked, instead of queuing up for the regular cron, maybe the notice is sent in a new cron that is once a day.

If done, it might also be beneficial to note on the parton's notifications how the notification was queued (right away/daily).