Allow unlimited amount of custom quarters

Currently in Setup -> Project Preferences -> Projects -> Custom Quarters, I am only able to specify 8 quarters. I would like the amount of quarters to be unlimited. Our instance has over 5 years of data, and if we do any trend reporting further back than 2 years, it shows "no value" for the quarter which is undesirable. We do have a custom calculated field for quarter, but it isn't perfect.