How do I change PTT from keyboard Ralt to Controller RightThumb?

New to LSPDFR and mods.  All is working well thanks to great modding community and support.  I do have a question; I installed Opus49's Grammer Police which is awesome but I wanted to change the default PTT for dispatch from keyboard Ralt (Rmenu in default.ini) to my controller's RightThumb or stick.  I reviewed all the documentation that Opus provides and watched several videos (Benzo/Opus) on how to install and use Grammer Police.  I have yet to figure out how to change the default Ralt key.  I went to the website that Opus provides in his documentation:

The key that activates the dispatch listener.  The value must use the System.Windows.Forms.Keys
format.  See: https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.keys
    NOTE: RMenu (the default) refers to the Right Alt key.
 

So, my grammer police custom.ini looks like this:

[Controls]
DispatchKey=RightThumb
InterfaceKey=F3
InterfaceModifier=LControlKey
SettingsKey=F2
SettingsModifier=LControlKey
RadioKey=C
RadioModifier=None 

But RightThumb will not work in game, only the keyboard Ralt works for dispatch.  Can someone provide some information or advice on how to change the PTT?

Thanks in advance.