i would have first person driver experience. when you drive through dirt it goes on the the window and windscreen wipers come and wipe it off. if you run through water it drips on your face.
if you get shot in the face by a bullet it cracks your visor and if the bullet is shot from a really far distance it gets stuck in your visor. you should be able to change more things on the elite to. if you walk behind a warthog or any land vehicle with wheels it though's dirt, water or what ever the vehicle is on onto your visor and covers your armor with dirt. there should be gravity hammer assassinations. there should be a suicidal assassination when you get double the credits and kills. And last but not least i would have more bungie members playing the game and helping design the game, the game is amazing as it is but if there was more time i think that they could have done better.