This is an idea we've had for a while. It's widely known that asking questions is pretty difficult on H.SE, and people often get frustrated if their questions get put on hold. On the other hand, if we don't close problematic questions, poor questions tend to receive poor answers. And then if we fix the question, we risk invalidating early answers that were made in good faith. This is a recipe for frustration and hurt feelings all around.
Rather than pushing every question into the deep end of the pool, I propose a sandbox for asking questions. The idea being, people wanting to ask questions can post a draft as an "answer", and more experienced users could comment with suggestions and point out common pitfalls. I don't know how much interest there is in this, but I think it would help improve the quality and atmosphere of the community.