The problem with your idea is that you are relying on the game detecting teamers and all it will do is follow algorithms you set out for it. For example look for people spinning, but what about people that spin to celebrate? Do they get banned too? Or look for players close to each other that are not being hostile, how about two players in bushes that are waiting it out, they could be very close but totally unaware of each other. It’s unlikely you can come up with a simple rule a computer can follow that does not result in the banning of innocents and I guarantee teamers will find a way of avoiding it.

All that said, I get the impression SC aren’t going to do anything about teaming, I got a reply from them regarding it and they see it as a legitimate tactic “do whatever you need to in order to survive”, they also see it as a risk/reward tactic, your “ally” could stab you in the back.