Default Search criteria

Hello ARS experts,

We have a need to make employeeNumber a default search criteria in the webportal when adding a user to a group. I see that you can add the criteria for searching one person. Although if allowing the search to default to employee number or another attribute we can add users in bulk by doing the employee numbers delimited with semicolons. Like with Mail or samAccountName. 

Has anyone changed the default search to include employeeNumber or another attribute?