Not sure I understood the mouse question:
do you mean you'd like the "mouse lookaround" feature working in a different way,
or you'd like an example on how to shoot at specific body parts,
or something else?
If the first one, there's an "advanced mouse lookaround" code nested inside the engine, you can unlock it by adding the "mouse object" extension to your project,
and going inside "custom movements - movement types and options - mouse lookaround" groups (and follow instructions inside)
Of course if any doubt let me know!