Personally, I always like feedback on what I'm doing wrong. I'm a tactics mod, but I also know that I'm not perfect, and every mistake that someone points out in a WFO game is one I won't make in the future! But then again, that's just my personal opinion, and you've no real way of knowing how others are going to react. I would suggest politely stating either in a PM or in the game thread itself that you found a mistake, and you're not sure if you should mention it.
Oh, and rules mods get the final word, you say? Muahahahaha..... :konrad: