I don't know if anyone is going to care what I have to say, but here it is. Limiting things is a wonderful idea, since there seems to have been a rash of profiles popping up with "Master of: Earth, Fire, Wind, Water, Lightning, Metal, Magnetism, Sound, Poison, Explosion and Wood releases, IN ADDITION to the twenty things they stole from other people. No rhyme or reason to it. More importantly, no balance. So yes, regulate, but to set down an iron clad set of rules, I disagree with.
The whole purpose of RP is to be an expression of creativity. I think people lose sight of that. Me, I've got maxxed KG and that's seven years of work but I'd be happy with just two. Can't really do that because everyone and their mother can blow up the moon and as much fun RP is, losing isn't fun. That's why I haven't had a serious fight in years, too much effort to take it seriously.
Another thing I see a lot of is people stating opinions like their facts. 'I don't like that therefore it's godmod.'
Having a rule of thumb seems like a good idea but high up people also need to have some tolerance to allow for individuality.