So this is brainstorming based on the comments I've seen.
One of the questions that I hate are the "Help! I've painted myself in a corner!" questions. These are the questions where an author needs a particular plot point to occur and needs the world to support it, but they've built the world too rigidly and they can't figure out how to do it. You probably hate these too. These are almost always "story based" because they are having to fit the changes into an existing storyline.
Of course, we also should recognize that this is a fundamental part of world building. In an ideal world we should all learn how to build worlds that are flexible enough to not have this happen. In practice, the art of jamming one last detail into the world is a required skill.
Spanish.SE's translation golf has an interesting rule: when asking for the shortest translation possible, you're obliged to provide a translation of your own. The idea is to prevent people from using their translation-golf to do translations for homework and such.
What if we applied a similar rule to a golf like game on WorldBuilding. You provide the world, a few key places where the world intersects with the world, and something you want to fit in place. You ask "What is the smallest change I can make to the world (in terms of amount of WorldBuilding/Writing effort) which lets me fit this one last detail I need into my world." You then provide an example of a solution which would fit your world.
I think this could work out similar to how Physics.SE handles homework problems. You're permitted to come to Physic.SE for homework help. However, you're required to show the work you've undertaken so far, and people ideally should coach their answers around the particular mistakes you've made.
From the comments, character count is probably not going to be an elegant scoring mechanism, but perhaps the standard voting process could be. Vote for the answers which, in your mind, are the simplest smallest changes possible.