Conditional Budget Rollover
I would like to see the ability to choose whether a budget rollover occurs at the end of the month if I have overspent or underspent.
An example use case would be, say I have a $300 budget for entertainment (high, but bear with me). If I were to spent $400 on entertainment one month I would like the amount to rollover and take $100 from the budget the next month right off the bat. However, if I only spend $150 one month I don't want to then have $450 the next month to spend. I don't still have that money ear-marked for a ton of movies, I'd likely put that money into rent or an investment. So in this case, I would like the rollover to occur ONLY if I have overspent, but NOT if I have underspent.
In the GUI for setting up a budget this may be as simple as having two checkboxes. One will cause the budget to rollover overspent budgets, the other one would rollover underspent budgets. Checking both would essentially create the behavior we have now, while checking none would just not cause any rollover whatsoever.
This way I can penalize myself for bad habits and more effectively reward myself for lean spending in my budgets.