These add your XP bar, +500 in SnD and match bonus. About the killcam timer, I don't know.
xblive_privatematch 0
xblive_hostingprivateparty 0
onlineunrankedgameandhost 0
Note that you will need 2 friends if you want to fake clips because it is an Azza Lobby and the host needs to leave after the ranked round starts and then join back.