Some interesting stuff there.
I'm guessing that the name "The Plume" was chosen for the area of the forum devoted to discussing BE fiction (not just the BEAddventure) because originally pens were made from feathers, aka plumes, and writers traditionally used pens. I agree that it's pretty obscure.
There's a piece of software for creating addventures known as Extend-A-Story that lets people add new options to existing episodes. See:
http://www.sir-toby.com/extend-a-story/. In practice, with the main addventure that uses this software people very rarely add additional options to those originally specified, perhaps because if they do so they also have to write the episode that the new option leads into.
Returning to the BEAddventure, the main annoyance with "Something else" options is when somebody uses one to start a new story totally unrelated to the story to date. I don't think that's how most writers intend their "Something else" to be interpreted. Fortunately it doesn't happen very often.
Until recently, there was a Wikipedia called FTF10pedia (FTF standing for Female TransFormation) that included some useful material about the BEAddventure, but unfortunately it seems to be defunct.