Things Fanfic Archives Should Invent: tell us when the author knows how the story ends

One of the most annoying things in fanfic is when an author starts an interesting and compelling story, then writes themselves into a corner and abandons it.

To avoid this, I'd like stories have tags indicating whether or not the author knows how it ends. No judgement either way, just yes or no. Then people who get annoyed by stories that are abandoned can skip those where the author doesn't know the ending until the author has actually completed them.

I would totally read a story being made up as it goes along by some of the more talented authors - people whose work I've previously read and enjoyed. But I'd like the option of opting out of stories by n00bs who don't know where they're going.