yeah this would be great. also the ability to have different columns (e.g. Last Played) in the sort order would be useful.
I'm not sure how actively pulpTunes is being developed, but I'd advise anyone interested in this to donate anyway, even before the feature is implemented, as a show of faith. $20 sounds like a lot, but fixing this is probably an hours long project, and $20 probably only pays for 15 minutes of a professional programmer's time. [no, i'm not a shill and I don't know the author of pulpTunes].