Hi Clay,
No, Adagio does not allow an email address to be the customer number. Nor is there a requirement that the email address be unique for each customer. There are scenarios where multiple customer records (say branches) might have the same contact email, in the off-line world.
A data structure change would be required to add an additional index by email address to the customer file in order to be able to search for a customer by email address. And additional R&D would need to be done to accommodate this, which I will leave for others to comment on. There had been some prior discussion about this topic among consultants and Softrak last week.
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Regards,
Softrak Tech Support