It may seem diminuative, but small details often cumulate to create art. It was in space marine 1, it was shown in a couple official trailers. Saber, please; add visual melee weapon holstering as shown in this image from one of your trailers:unnamed.jpg

Im not a game designer; I don't want to be arrogant but it can't be too difficult to do this, I hope. It looks badass to see your wargear on your hip reacting to the physics of your movement and - in my opinion - increases immersion when I'm not pulling my melee weapon out of the warp on command (out of thin air).