If you can figure out sourcepawn and edit the plugin, be my guest. A suggested ratio would be crits enable after reds outnumber blues at a split of 80%(reds) to 20%(blues). Quick note for the future, if the ability to do such doesn't exist, please either be willing to do it, know someone who will do it, or choose not suggest it. If a way to implement this exists and is able to be implemented please link it.