Language input key support on the host client

An issue concerning Japanese keyboard support:

The host wants to change the input method on the guest computer. So the host presses the 半角 / 全角 (hankaku / zenkaku) input key — placed at the top left corner of Japanese keyboards. But the guest computer's input method doesn't change. So, the host must change the input method by navigating the mouse to the task tray and clicking on the icon that manages the input method. This is a tedious process, given how very often a typical Japanese user switches between these two inputs.