When you're looking at the list of series a patron has been signed up for, would like to see either a date WHEN signed up OR date when series was COMPLETED. I LOVE to sign patrons up for series; but if a patron has over 10, it's a lot of work to tell them if they have read all the books in all their series! If there was a completion date, we would know the patron needs some new series.
Some kind of indication that a patron has had all the books in a series is something reader advisors here would love to see, too. Similarly, if all the books of a preferred author have been sent, an indicator would be nice. Of course, if new books come out by that author or in that series, we'd want the "complete" note to clear.