The Mac keyboard syncs up very well to the Windows keys in other Windows programs, all except for Feral Heart. I can press the Left Command key and it works as the Left Windows key, making the Windows Start Menu pop up. I do not believe there is a issue with the syncing up with Windows keys, but rather Feral Heart itself having the issue of recognizing these keys.
Yes, it might be helpful to have the Mac keycode for the = key, but if Feral Heart is registering the Left Command key as a Windows button, why would I insert the Mac keycode for the = key? But I guess it's worth a shot.