The wt.org.WTUser type will only display user information in the pull-down list. From what I've been able to determine the CustomVariablesDataUtility.java is the data utility class used to render workflow variables on a task's page. The class checks for the variable type and if it is Enumerated type (i.e. extends the EnumeratedType class) then it renders the variable as a drop-down list. You will probably need to create a custom class that will extend EnumeratedType and specify the class as the task variable.
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