A gaming system comprises a wager input device for receiving a primary wager and at least one display for displaying a selected primary wagering game, the selected primary wagering game having a primary payback percentage. The system includes a control interface displayed on the at least one display, the control interface comprising a plurality of available supplemental features. At least one controller is operative to (i) receive an operator activation selection of a supplemental feature selected from the plurality of available supplemental features; (ii) receive an operator configuration selection of at least one parameter of the selected supplement feature, the at least one parameter including a feature payback percentage of the selected supplemental feature; (iii) active availability of the selected supplemental feature for the play by a player of the selected primary wagering game; and (iv) display an overall payback percentage on the control interface.