[otrs] Search function for Customers in Tickets

If I wish to create a new Phone- or Email-Ticket, there is the ability to put the customer's "Lastname" (or part of it) in the "From:" field and click on the "Search Customer" button to find the correct person. Unfortunately, searching on "Firstname" or "CustomerID" does not work. Is there a way to extend this "Search Customer" button so that searching can be done on 'any' of the fields of a Customer? Thanks for your feedback.