Sword would be easy to make usable. Same thing with Wraith. But the fuel rod gun requires Eschaton or Custom Edition modding programs (to transfer the multiplayer fuel rod gun since the campaign one can shoot infinitely and would take several minutes to adjust).
Let’s face facts here, a lot of Halo fans may not have played CE, or may not have enjoyed playing it simply for lacking these simply functionalities. I know that since I sold my copy of Reach, I’m already displeased with only being able to play multiplayer on the 7 maps provided with CEA. I need no more disappointment in relation to something as awesome as a remake of Halo CE.