Valid points Prime.
Though I confess to not getting the make up their own rules.
One of the make up their own rules arguments I saw earlier was elminsters spells.
All casters can research custom spells...I fail to see the problem here.
The Chosen of mystra "template" which barely deserves the name from what I saw seems to be something that would be obtained via role play rather than strict mechanics
But I am going to freely admit I dont really play in the realms and havent read to terribly much on it other than the mechanical options available in the books
So I have to assume either
a) people are complaining about a wizard researching custom spells...which seems kinda silly to me or
b) people are complaining because those spells break fundamental rules of the game.
Which would annoy me to a degree too.
But, and correct me if I'm wrong, aren't spells that do something normally not allowed by the rules by their nature treated as the more specific rule in the instance they describe and thereby trump the more general rule they may be violating?
I apologize for my poor english skills redneck is my first language