Back in the days, the original Khthon had a rule where only heroes were eligible for government positions, except for banker.
Khthon eventually died, and was formed again. This rule was reinstated (though maybe it was only for rulers then).
That Khthon eventually died again, and it was later reformed under the name of Bara'Khur, which I'm pretty sure reinstated the rule, at least for the ruler and at least at the beginning. I think they added a clause to allow cavaliers as well.
No one ever raised a fuss about this. As far as I know, no titan complaints were ever made, it was never criticized on the message boards or on the forums, but that wasn't because people didn't know about it, as it was fairly-well advertized as the flavor of the realm, the "land of heroes" and all.
That was a while back, however, and sensitivities have somewhat changed. Player-imposed rules of governance, that used to be a lot more common back then, are also considerably more infrequent nowadays. So I'm wondering, would this still be allowed as it was back then, or would it be judged as a breach of the class-choosing IRs?
