Indeed, I was thinking of something along Official Works:Touhou Project, though both Canon and Official do sound weird.
I think I just can't find right word... Spin-off? Wrong too, anthologies aren't spin-offs... Some word to unify Officially-Published Fanon and Spin-off... Hmm, on MyAnimeList it's tagged as Parent story: K-On!, and on Baka-Updates it's Adapted From: K-On!.
"Thematically" many of those things are more doujin-style, even if "really" they aren't doujins. It feels like there should be separate directory page for those, but then again - the number is pretty small, so I guess it's not worth it.
I guess, unless we get sudden influx of those works, current approach is best, I just...dislike stuff that's out of The System...
I guess most systematic - but also realistically worst - approach would be splitting Doujin: Touhou Project tag into two: Doujin + Universe: Touhou Project. Then Official works would be Canon + Universe: Touhou Project, or Spin-Off + Universe: Idolm@ster or Official Anthology+Universe:K-On!. But yeeeeeah, this is too much for barely dozen of mangas.
last edited at Jun 6, 2014 11:15AM