I don't think that would be nessessary here, people have the option of turning off comments. by separating the gallery there would still be no way to prevent critcal comments in the "just tell me how great I am" gallery. We don't need the comment police. I would rather that the galleries be separated by theme. (or at least a separate gallery for cheesecake images, it's getting a little monotonous looking at naked chicks all the time)