A gaming control board (GCB), also called by various names including gambling control board, casino control board, gambling board, and gaming commission, is a government agency charged with regulating casino and other types of gaming in a defined geographical area, usually a state, and of enforcing gaming law in ...

The answer is yes, the casinos most certainly can change the payout schedules on slot machines at their convenience or, as you say, on demand. But there is some effort involved.