I would like to have a timestamp update when a certain field is modified. Whenever a System Note for this field would be created, I would need to take that Date/Time and stick it into another field.

I can't use the System Notes field in my other complex searches, because it is another join in the mix and messes up the search. So, I wrote a Scheduled script which looks at a saved System Notes search with the Max of Date for this field change, and save that date/time to the item.

However, I would rather employ a SuiteScript User Event script at the time that the item is updated, so that this timestamp is as accurate as possible. Otherwise, we have to wait for the other jobs running at the top of the hour and this follows, etc.