1. Dependant dropdown fields.
Ex: when User select "Country" from Country drop down field, it should display corresponding states in "State"field
2. Conditional based display fields
Ex: When user select or type "Email" from "input" field it should display email address field on the form else it should not display email address field on the form.
I think if CA will include this customization or more out of box on one can beat CA SERVICEDESK.