Well, having played on a cab with no calculator, and on 106 with Pauline open, I would say with no reservations that Pauline is definitely an advantage. In fact, having personally experienced it as an advantage is exactly why I feel the way I do about this. It's not a HUGE advantage, and neither would this internal calculator be, but it's a little somethin'. Not having to keep track of what I scored on the previous board or level because the stat is right there is one less thing to think about, and "one less thing to think about" makes a difference.
I'm not saying the answer is "ban Pauline", because a no-Pauline rule would be completely unenforceable and it's too late to do that anyway, but "disallow a modified ROM with a pace calculator" IS enforceable, and probably (?) should be.