Provide additional info (email?) in @-tag options to help distinguish people with the same name

When @-tagging only first/last name appears. Suggest adding another distinguisher (email address or roll-over profile info.?) so that it is easier to distinguish the correct "John Smith" from all the "John Smiths". This may be especially helpful to groups like ours using SSO because we cannot provide distinguishing names in the user profile that will survive the next login when SSO is re-authenticated.