SlowBrain:
When it was possible to send directly Keyboard Keycodes for émulating keyboard, Like a real keyboard (it that don't know what drawing it was on her face)
The Leonardo does send key codes. It uses _asciimap to convert from 7-bit ASCII to US-EN keycodes.
Looks like you can send keycodes directly by using values from 136 to 255 (sends keycodes 0 to 119).