Another example, suppose you are a school teacher and you end up budgeting for extra supplies for children in your class and you want to compare your spending in this category for different school years. (Never mind the fact that you currently can't even total category spending by calendar years within the app.)
In all of these cases you might try setting up a new category for every school year and "archiving" (hiding) categories for previous years to keep from cluttering up your budget. But besides the fact that you still wouldn't get totals across any time frame shorter or longer than a calendar month, this is tedious and ugly.