> 1. Where is the Right Windows key defined in Trinity? I want to 
> completely disable that key in Trinity.
I am not an expert, but it should be in /usr/share/X11/xkb/rules/
 
> 2. In KControl->Regional & Accessibility->Keyboard Shortcuts, 
> toggling the bottom check box "Use Win key as modifier" has no 
> effect on the Apply button. Would someone please confirm?
Confirmed. Time for a bug report
  
  Michele