Okay hear me out, imagine instead of "Falling off a building" or "drowning in a lake" to pk your self you could totally take a pistol or a shotgun and totally like blow ya shit smooove off.
Like imagine you're in a meeting or something or a public gathering and you wanted to ruin someones day so badly, you could just stand up, have an animation of a glock or vp70 or whatever, point it at your temple and then you can shoot. With shotguns or rifles it would be more like a curt cobain/dayz suicide where you're on your knees.
idk just a thought. Thought it would be kinda funny and pretty dramatic for RP scenarios like shooting your self before the cop does or something idk.