Please provide the ability to view reports that other users have created and pull them into our system if we want.
Custom fields would need some detail showing the type and there should be a note section where the creator can explain how the report works and what custom data is in use, etc.
Edit for clarity: I'm asking for a place for us to share reports with each other. Not just within our own WF instance but with the user community at large. Users from different companies, etc. sharing the great reports they've created. This wouldn't share sensitive information because we're not sharing data - just the report, the structure and rules.