Locking only the mouse look

A look lock stops the player turning the camera with the mouse, and leaves walking free. It is counted for each mod id like Lock.

PlayerMovement stop and restore the mouse look

Call LockLook to stop the mouse look while the player can still move, and UnlockLook to give it back.

public static class PlayerMovement
{
    public static bool LockLook(string modId);
    public static bool UnlockLook(string modId);
}

Method	Returns	What it does
`LockLook(modId)`	`bool`	Stops the mouse look. `false` if it could not.
`UnlockLook(modId)`	`bool`	Lets go of your newest look lock. `false` if you hold none.

Things to know

LockLook(modId) stops the player’s mouse look and leaves movement free. Two LockLook calls from one mod need two UnlockLook calls. (it sets the game’s rotation flag through ThirdPersonCameraController.DisableRotation.)
The game can still turn rotation on and off itself, and your lock stays. Rotation is off while the game wants it off or any mod holds a look lock. So when the game turns rotation back on (in a chair, at a computer, on a ladder, in the cards game), it never ends your lock.
UnlockLook never turns rotation back on if the game turned it off. (postfixes on DisableRotation and EnableRotation track whether the game wants rotation off. The framework’s own calls are ignored.)

LockLook returns false and takes nothing when the camera is not loaded, while a save is loading or being written, or when the rotation hooks did not set up. A bad mod id throws an ArgumentException.
A single-scene load clears every look lock, and so does the player dying. The camera may be replaced, so the game’s tracked state is reset. Take your lock again from your own handler. (the death case is Survival.PlayerDied.)
There is no event for the main menu. The main menu is loaded as a single scene.