Not 2... Placing the kind of restrictions that people feel are necessary on the ID removes pretty much all point of it existing, and could potentially create some very sticky tournament situations.
Far better at that point to do away with it entirely.
Personally I'm ok with the existence of an ID option.
So: 1 for me.
What I am curious about is why the game is running on a W/L/D system, when you could probably just rank players directly by their net MOV.
Not sure how that would impact the ID situation.