AutoInviteFriends(AIF) is a simple World of Warcraft addon that just does three things:
Invites everyone in your friends list into a group. It only invites those friends that are online and currently not in a group.
Once someone is invited, it sets the group loot to be "Free for All". Note that in a future version, I'll add an interface component to choose the loot type/threshold.
If someone on your friend list sends you a group invite, it automatically accepts it.
Sure, this addon is not for everyone. I find that most of the time, I'm playing on a 1:1 team with whichever friend happens to be online at the time. This is just a convenience addon allowing me to do automatically do what I was going to do anyway.