Flick Stick would be a good control option to add. Since it takes away the ability to look vertically using the stick, it is typically implemented alongside gyroscope controls which is already a separate feature request. But it would still be useful to add before gyro, since on certain controllers like the Steam Deck, the touchpad can be used for mouselook while the stick is used for turning.

Describe alternatives you've considered
Flick Stick can be used with programs like JoyShockMapper and Steam Input, but this requires the user to manually calibrate it to the game's sensitivity, unlike an in-game implementation.

Additional context
https://en.wikipedia.org/wiki/Flick_Stick