Have you ever taken a hit from seemingly nowhere and thought, "who the hell was that?!"
Similar to how you are told when someone team hits you, I want to know the name of the person who shot/threw at me. I want to know who I have to hunt down. I want people to know it was me that shot them. This should be easy to implement, and would be a simple, fun edition to the mod.
I'd suggest this for melee hits too, but that would get annoying very fast.