Yeah, I guess I am the last user, but it's really a
great tool for lefties like me.

If you would make a 64bit build, I'd gladly test it.
I have zero experience with C++ (I'm a Managed Code N00b), so I will probably not be of much help, but I would give it a try anyways. With a Visual Studio project, even I should be able to set a breakpoint or something

I have no clue as how to detect a non-detected double-key-press but still I'd give it a try.
You got my mail address so if it's a small project just throw it over the fence or send me a link where to get it.