Custom Field for Duplicate Filtering

Our company's product is built off of the assuming that one person can create multiple product accounts. This is just the nature of our business. Therefore we have two unique identifiers that are very specific for filtering out legitimate duplicates. Email and a custom "Account ID" field. If we were able to use the "Find Duplicate" filter off of this account ID and email we would be able to easily keep our database clean of duplicates. I know i've seen other people with similar needs and it would be great to have other fields that could use this filter