To clarify some terminology here, "Canon" actually refers to the original story. Fan fiction, by definition, cannot be "Canon". From "Wikipedia":
In almost all cases, fan fiction has never considered canon, as fan fiction is usually produced by amateurs. Sometimes, however, events or characterizations portrayed in fan fiction can become so influential that they are respected in fiction written by many different authors, and may be mistaken for canonical facts by fans. This is referred to as "fanon". The use of fan fiction to fill gaps or continuity errors in canon is derisively called "fanwanking," or "fanwank". (The terms fanon and fanwank can apply to officially licensed works as well.)
Stories that change essential elements of the original story (i.e. Jack didn't die), are generally referred to as AU, and those that continue a story without changing its essential facts may be called a "continuation", and often people refer to fanwank and fanon as "Canon", in the BBM world.
However, none of it is any more "Real Deal" than any other type or story, and all of the types of stories are equally welcome and valid as fan fiction types as far as Bettermost is concerned.
In designating the "type" of fic, the most meaning information to include, i.e. as listed on Fanfic.net, Wranglers, or Brokebackslash is
Pairing (Jack and Ennis, Jack and OC, Ed and Hank, Earl and Rich, etc.)
Rating (PG 13, NC 17, R, etc)
Warnings (special advisories, such as Dead Jack, Character Death, Explicit Sex, Child Abuse, etc, that readers should be aware of when they look at the information page.)