RECOMMENDATIONS FOR HALO MULTIPLAYER

This is for my son David. He loves Halo and he was asking me about how to get in contact with 343 Industries. He was asking if there was a way to include a few items into the multiplayer spectrum or with REQ Packs? He would like to see Emile’s knife, Halo Reach Shotgun, and also make a new map in War Zone. Also, he would like to see if Jun can come back. Thanks for the view.