Add count of number of leads with a value in a field to Field Management

When evaluating whether a field is being used or not, Field Management allows me to see all of the Forms, Smart List and Smart Campaigns, where the field is referenced, which is helpful.  Also helpful would be an indication of the number of lead records that have a value in the field, so you can see how prolific its data is (other MA solutions provide this).  Also helpful would be the last field update date, so you can see if the field data is being changed.