In the VCS, you can create a pull down menu by starting with a fader, then from the Options menu setting tic marks and labels, setting the labels you want, and finally changing the widget type to Select from List.
However, in the class editor there's not a way to define the list of options in a pull down list. Since you have a list with three integers, perhaps you could call this parameter "Cost" or "Efficiency" and let people select from three different levels?