There are technical reasons as to why i cannot add more death animations to a single model. The death, decay flesh, and decay bone are three different animation tags with different variations. There is no telling that "decay flesh - 2" will come after "death - 2", so to make this, i would need to have all the death anims ending up in the same pose, which would look strange. The crossbowman model however, has a unique death animation.
As for liveliness, is there any particular animation you are referring to?