I admit, I barely go to Fanlore or know a thing about it... I am gratified at how opinionated the tag wranglers are being already without waiting for permission, and I did put in my two cents for something like what you describe --- and made sure to tell them I thought they should start with an open comment period (seriously, it would just look better and the org could use that).

A totally different thing that's come up and that they're discussing is generic metatags cluttering the "most popular" listings under the Media (not my own hobby horse, but what shows under movies here is pretty dang ridiculous, yeah); I thought it might be good to just put sub-media there instead of specific fandoms, so, say, as an anime/manga fan I wouldn't just see myself erased from that main page, but I also don't tend to get into megafandoms so the skin wouldn't be coming off my nose...