You can actually manually input your own tags. We don’t provide pairing tags in the drop-down menu, for example, so some members like to add a tag upfront about the story's pairing.
What we do ask, however, is that you stick to our tags for trigger topics. As an example, “Non-con” is not a valid replacement for the “Rape” tag. You can add Non-con, but you must have Rape clearly tagged. The same thing goes for anime-specific age related tags. Minor1 and Minor2 are not optional, or replaced by Shota or Loli.