It’s a bit more disappointing in Rage because the actual hit reaction behavior is so fucking extraordinary.
I’ve seen ragdoll blending in source… Only used for characters who are on fire. It looked like shit.
I’m not saying that it COULDN’T be made to work in source, but it might be possible that it would be very difficult.
What I would want to see is a ragdoll that started stiff and springy on death and then after about a second or half a second it goes to full fluidity like default.
That way it could balance a bit if you get a clear headshot then collapse on the floor.