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To help us identify which scripts have been marked as not working / working could we have it as a separate feedback option and maybe show the date of the last one that was marked?
The problem with this (and similar proposals) is that individual users may not be correct when they do this - they could be mistaken or mark a script maliciously. Script authors will want the ability to to clear this tag, and they themselves may not be correct either.
I've been considering a system where if the n past reviews were bad, the site would notify the author to check their script, and if they didn't confirm that it's still working or post an update, the script would become hidden. This would help them fix up old scripts, as well as clear out abandoned, broken ones.