What should be a penalty? (as suggested by Alexis)

So, I guess the question is….
If in this lovely game of bike polo, players were to find themselves playing with little or no regard for our slim set of rules and/or the few accepted codes of etiquette, what is it that shall be done?

I’m seeing two parts to this question. The first part is what should be a penalty?, and the second part is, what should be done?

The rules outlining the tap back in penalty are pretty clearly defined, but in what case(s) should more be required? And if more is required, what should the more be?

If you’d like to leave a comment please note the city where you play. Thanks.