Hi guys,
when I tried to remap the function of looking back, the game itself did not recognize the Input I made. I remapped “numpad 2” to “arrow down”, also NP 4 and 6 to arrow left and right. The last ones were remapped successfully, but the first one stayed at the previous mapping.
When trying to undo or redo the functions, “Looking back” wasn’t possible anymore, seemed the whole function was deleted.
Like you can imagine, the OS and Plattform are Win10 PC 
Thanks and cheers.