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With the playerbase being what it is, I think you might be able to modify the behavior of classes by approaching individuals. Because everyone has every class, you aren't dealing with "thieves," you're dealing with people who play a certain way. The practicality of amending the game mechanics any more than they already are is absolutely laughable considering the size the game right now. If your chess partner consistently uses a tactic that bothers you, it would make little sense to change the rules of chess, just stop playing with them or learn to live with it. It's not like the world is seriously overcrowded.
tl;dr: you: wah wah wah
