If you are friendly, please crouch or jump when you see another person looking at you, this will make everything so much easier if everybody would follow it. I know Psi came up with this method but i just wanted to spread it around so people who doesn't watch his videos will hopefully do this too..
LoL, me and my friend did that long before Psi came up with it, think many other do to
problem is if you wanan kill some one jump and they think your friendly and kill em anyway.
so still its all about trust.