this idea is for a system that allows the user to control their parks population limit as a manager maybe have a station in the checkout booth that'd allow you to boost it or lower it at will.
system could solve performance limitations as it'll be upto the user to see how much they can push
the system could increase max population every / every few milestones and the selected population would not increase upon unlocking it the user would still be required to allow their park to have more capacity