Recently one of my little heretics (a CSM-Chosen of Slaanesh) managed to get his fingers of a Astartes pattern Jump Pack and after going through the entry on the list, I am a bit disappointed by the thing. I mean, it let's you ascent to the heavens like a burning demon of fury and rage and all he gets out of it is double base movement and one hour of flying? Maximum 2d10 of damage if they take the "Raptor" talent?

Any ideas how to augment this to make it a bit more brutal? Especially if he jumps into hordes.