The 'Quick Input' should mimic a a standard keyboard, in that whatever is available on your keyboard can be typed out. It doesn't type just anything, just the characters that you can type yourself without alt codes. If it's not something that is available on your keyboard (such as the German 'ß' on a US keyboard), it will render as a space. However, if I add German as a language to Windows and switch to that keyboard, 'ß' will type out.