This rigid simplistic attitude is precisely why we can't have nice keyboard things and have been stuck in the same state of bad defaults for decades
The only differentiator for a modifier state is that it... modifies! Here is a wiki common sense definition
> In computing, a modifier key is a special key (or combination) on a computer keyboard that temporarily modifies the normal action of another key when pressed together
So your limitations don't make conceptual sense, not only can you have LShift vs RShift modifier state, but also you can have an F modifier state when you hold down the F key to modify the behavior of other keys
> OS does not supply it
Unless it does?
> VK_LSHIFT VK_RSHIFT VK_LCONTROL VK_RCONTROL VK_LMENU VK_RMENU These left- and right-distinguishing constants are available to an application only through the GetKeyboardState, SetKeyboardState, GetAsyncKeyState, GetKeyState, and MapVirtualKey functions.
https://learn.microsoft.com/en-us/windows/win32/api/winuser/...