IMO it's always fine to be creative when listing a past job title, PROVIDED you are trying to provide more accurate information and not deceive. I've had titles

IMO it's always fine to be creative when listing a past job title, PROVIDED you are trying to provide more accurate information and not deceive. I've had titles that do not at all accurately reflect my day to day, so I list them as something more topical. However I will never portray myself as having more authority nor more day-to-day experience than my title would have otherwise conveyed.