Unable to Program Button because it is listed as Button 0

[CtrlAltPizza]

Basically the title, just got my Riffmaster and wanted to use it on some of the older Guitar Hero games on PC. Problem is, one of the Button's is named and is an instance of 0. It doesn't appear under the Button's list, only showing from 1-14 for the rest of the input's on the device.
I tried setting it to something else, copying the preset and modifying it to have the listed instance be 0, only to have it set the right shoulder button (what I am trying to set to) as blank. I am new to the program but haven't been able to find any way to forcibly set/modify the device object to get it to work