Like, having a "tag of the day" where clicking that button automatically adds the post to a list of posts to be reviewed for that tag. I'd suggest having it add the tag automatically, but I suspect that'd be too easy to abuse.
Basically, it'd lower the bar for getting users to flesh out tags, especially if the pool of tags that could show up was pruned down to the more straightforward ones. Types of clothes, level of undress, types of genitalia, and so on, rather than tags where users would need to wonder whether or not they qualify.
It's common for people to note that a tag's missing and just move on, but one click wouldn't take much effort, and the system would probably encourage itself by making people feel like they've had a favor requested of them. Hell, the tags could even be randomly assigned instead of being the same for everyone.
Ideally there'd also be a way to make confirming those reports not staff responsibility, but that's very much not my wheelhouse.