Does the original beta #1 really work? WinUAE did filter key press if key was previously pressed and release event hasn't been detected yet. This needs to be done because WinUAE of course must work with normal PC keyboards. (8.6.2013 version tries to be more intelligent and only filters repeating key press if another key release event has been detected)
Also host key to Amiga input event (key, joystick, mouse etc..) conversion filtered keys without release events. There is no way it worked previously.
Unless you did something else and I misunderstood