Add search option for level of movie production

I do believe such a feature already exists on IMDbPro. Is there a good reason to extend it to people who aren't paying customers? Maybe frequent contributors, even the ones who don't ordinarily make the Top 250/300 leaderboard might be interested. I don't recall being bothered by not being able to search by the production status criterion. O, but now I'm curious about acquiring a list of titles that have been stuck in development hell for a long time. Unfortunately, that would require the search feature to account for the timestamps of IMDb's awareness of production statuses.

That feature existed in Advanced search until 3 or 4 years ago and then it was suddenly removed.