you can shoulder swap in deadlock, especially useful when shooting behind cover
the design is very human
citadel_camera_pitch_max "180"
citadel_camera_pitch_min "-180"
in convars.
i dont recommend higher values because it will confuse you how many "spins" you have done.
explanation: 180 + 180 gives you full 360 range, ie unlocks 182 degrees of freedom over default (89 both), which have your camera inverted. inverting camera also means your left and right are swapped, or, that you are using a different shoulder.
although all your controls are inverted too
jokes aside, we really should get a shoulder swap button at some point, and also r at least have a real slider for these values up to 120 or so. try it out, on characters that use verticality of the game it helps a lot - think of all the times your camera was locked while trying to look up.