This would be included in damage filter outgoing or incoming but I feel it would only work for players and wont work for npcs.

It is located on actions Attacker/Victim and it would be called: <Actions: Victim/Attacker> Freeze

This would basically freeze the Attacker/Victim in place for a couple seconds or however time you like, of course it would be a boolean but if you want to you could turn it into a number.

Just a simple suggestion I thought would be cool.