I agree with everyone else saying that supernatural/paranormal would be very nice additions to have.
I'm currently labeling my story as a "fantasy/horror/mystery" and tagging it as "urban fantasy", although truth to be told I don't feel like the "horror" part is all that prevalent in my story (I mean, yes, there will be vampires, werewolves and some gore, but... more like what you'd see in a "Buffy The Vampire Slayer" episode than a "Saw" movie? XD) and I'm only just starting to realize that most people apparently think of the "fantasy" genre as something more LoTR-esque rather than modern/contemporary? D: Anyway yep, more sub-genres would be neat! High fantasy, urban fantasy, paranormal romance, dark fantasy... honestly, there's plenty of labels that could be added, and not just for fantasy
I think more filtering options for all genres could help both readers (who could then find the exact type of content they want to see) and creators (who'd have a chance to become more noticeable in their specific niche instead of getting lost among thousands of different comics/novels all lumped under the same genre).