Well if you want to get as specific as the controll layout then you would have to do that for everygame anyways.
And everyone who was going to challenge an Arcade games score would have to use the same model arcade cab because they all are slightly different.
The reason i am going with WolfMAME being ok is because if TG will accept it for their world hiscore records i would suppose it is acceptable for our reasons.
I also agree with the no PAL vs. NTSC because of the differences. But that also does make things still that much more exclusive. But it can't really be helped. Take your wins with your loses