My point remains it could be cheating whether it specifically says so in the rules or not.
Which I think any reasonable person would agree to, which why I don't think it's a question that needs to be addressed.
Now obviously I have answers to all of this, but it bears consideration.
It does. I think this would all fall under TO Discretion.
Now as far as the unpainted faces, the <crit> and <hit> sides are not the same really. It may not be easy to see, but they are different sizes. If you look at the picture on page 1 you can see the difference.
Also the rules do say that altering components is under the discretion of the TO. So if someone does mark a die, they could just ask the TO ahead of time if it's ok or not.