I personally think we should leave this up to the posters. To create rules to limit one's argument no matter how radical it is will kill the fun on kmc. Posters will always get pissed and overheated at one another(just like Rulk) no matter what the rules are.
I agree if we are going to change it then we have to find something in the middle of herochat and cbr although I personally love herochat's way of debating. Its all up to the poster and you cant hide behind pis or use it at your convenience like some seem to do here. Thats how they argue things on cbr and use pis all the time. Most psoters complain about how unfair it is over there as I pointed out earlier.
I think pis and cis should be eliminated altogether. If someone wants to be a dope and argue spiderman beats firelord then school the shit out of them. But rarely in comics does something this awful happen. Granted it does and will continue but how often does a wolverine defeat the juggernaut straight up without a plot device.
Rely on your own unique arguing skills and prove your points however you will. Lets not restrict or try to restrict someone's creativity based on the rules. This is meant to have fun and lets start having fun again.