I think dead body's should be able to stay longer instead of fading withing around 7 seconds. Just personal choice really but would make the game more immersible.
I'd also like to see corpses stay for a bit longer.
Perhaps limit the amount of corpses the way you can in CoD? Small/Normal/Insane amounts in the options menu.
It would only be a problem if people still use 5 year old PC's to play the game.
I think the majority of gamers today have decent hardware that could handle this. They arn't exactly Crysis quality models.. I guess Tripwire could make it an advanced option, but then how would they balance that for the servers?
Maybe if it was simply client side only?