I found the forum through the Contact Support page. Just add a button in the Contact Support page for "a NSFW game page is not flagged", context of "provide us the name and/or link", and clarification about when the clickthrough is mandatory (and thus the sort of thing it's appropriate to bother Staff about).
I don't remember when I first saw clickthrough used for a confirmation screen. ("Nag screen" is interestingly new to me.) But I'm reasonably sure I have seen it used for that, in multiple contexts.