Freelook left/right keybinds for FPS

[Monomoy]

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F22::
SetStoreCapsLockMode, Off
SetMouseDelay, 1
SetKeyDelay, 25
SetDefaultMouseSpeed, 1
MouseGetPos, x, y
Send {F13 down}
MouseMove, 4000, 0, 15, R
Send {F13 up}
Return

Thought it would be a lot easier to bind left/right freelook glances to the mousewheel side-clicks, rather than manually holding the freelook key and moving the camera

So far the problem I am having is, MouseMove (relative) isn't causing mouse movement in-game, but works for sending mouse movement outside of the game ...

I read that sending a dllcall mouse event might work