Improvement "For Korean" settings

For Korean user, <code>__KeyOverlaidModifier__</code> may occur annoying function if switch IM frequently. Hastened pressing key may close windows or quit applications if it is pressed with <code>W</code> or <code>Q</code> which are for starting characters in Korean letters.
With virtual machine, which keyboard driver is using decide what key is used for toggling IM. And, in some circumstance, windows in virtual machine need additional keyremapping with registry.