Also seems there is no way to invert Y axis on camera for left stick, for instance, when aiming the cannon, or looking around when the camera is zoomed in. These options only work when free camera is on, but these invert camera toggles should work even when it's off. As swapping these in "%AppData%\sm64ex\sm64config.txt"
key_cleft 014b ffff ffff
key_cright 014d ffff ffff
Doesn't do anything.