Benefits (How this will benefit the server and game as a whole): m-muh immersions
(also may help medics/xenos find their buddy/victim)
Details (Description of how you think this would work, the benefits, etc): pretty simple tbh, just replace the .wav/.ogg file of the current screams and replace them with actual painful screams. And it can't really get spammed, because as far as I know, the server already has a cool down on manual sound emotes (typing "say *scream" 5 times would make it tell you to wait instead of screaming 5 times)
Implementation (Optional, if you have an idea how to implement it):
replace crit screams (if possible) with these
https://www.youtube.com/watch?v=ldNSMnEeKio
these may a bit long and immersion breaking if a baldie is screaming these out while he's in briefing, but if these can't work then these can
(Volume warning by the way)
https://www.youtube.com/watch?v=_u2GA_iJwiQ
It would probably work best if the first video's sounds are used when a marine who's under 30 or so health screams, he screams like so, but otherwise screams like the second video's sounds.