Trail of blood on the floor and walls after the player bleeds.

[Matheus1111 10]

To increase reality and help players locate injured players and run for cover.

[damca 11]

Yes please. This would also be a great addition for figuring out the reason for someone's death, and if the blood dries over time (like in cs 2), it could also be used to figure out the approximate time of death, even if the body is cut up, despawned or buried.