PMDG 737NGX - Disp. mode

Hello !

I'm building a home cockpit using the 737NGX, as well I'm using LINDA to configure my buttons and switchs.
My question today for you captains is : There is way to modify the code to have the options to use a selector switch for the Display Mode ? I'm mean ... as the auto-brake we can select the option RTO, OFF, 1, 2, 3, MAX not just increase or decrease. It will be very practice to program these selectors. In the mean time, I'm not sure to understand what the option "show" under the disp. mode menu does. I have tried to assign it to a button, but nothing happens.

Thanks to help !
Ben