Please don’t.

I wish they could have Unreal Tournament sounds to add in Portal the deathmatches. That would be cool.

"Rampage", "Running riot", "Unstoppable", "hattrick", "headshot" with that deep low voice. 😂

I like the headshot sounds Insurgency Sandstorm has. Well from the victim's perspective they hear this definitive sound that they had their head blown off. The shooter sees the victims head explode. So cool, if you like gore. Of course, give them option to turn it off for those who prefer not to see that.

It isn't Unreal Tournament

There is a distinct sound for headshots (pretty much the same as in 2042 to my ears), but nothing for multi-kills to my knowledge.