Now that Fields can be made visible or invisible per-Project, it would be really useful to easily be able to find out in what Projects a Field is visible. This would help site admins know when Fields were no longer being used and could potentially be deleted, or to see if certain Projects are not utilizing certain required Fields. This will become a much more urgent need as time goes by and studios build up long lists of Fields, and need to periodically cull the master list to reduce server complexity.
This could be an added Field on the Fields page showing "Projects Visible In." Or could just be exposed in the API so that a script could report what Fields are not visible in any active Projects, or whether certain required Fields are invisible in any current Projects.
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