Keyboard emulation on native USB is not a keyboard

Hardware Arduino Due
2

Depends how the Game read from the keyboard, does it takes only the final characters or in raw mode how long the key is/was pressed ?

Just a single character:

usb_keyboard_press(KEY_A, 0);

Beginn:

keyboard_keys[0] = KEY_LEFT;   usb_keyboard_send();

End:

keyboard_keys[0] = 0;
usb_keyboard_send();

I had this issue with a Flight Simulator, steering right/left was unusable but navigating through Menus worked well. (Also in a Texteditor, but not in the Sim)