I'd love the positist calendar. That said, even just having 7 months with 30 days and 5 with 31 and either grouping all the months with the same length together would be nice. E.g. jan-May have 31 days, all others 30.

Also might be nice if we can fix names so that months match their names again (September being the seventh, October the eighth and so on.). It's insane we lost this because two emperors named some months after themselves 2000 years ago and we are still stuck with it.