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Roo will change the z attribute to user-managed as soon as you make a change to an element. This is to ensure that your changes are not lost for round tripping. Of course if you make changes to an element you are taking over responsibility to manage it yourself. See http://static.springsource.org/sprin...x.html#d4e1544 for details.
Actually, the errors instance is being passed on to the jsp and displayed there. Check the form:errors tag in input.jspx for example. To see it working just use one of the JSR 303 annotations (ie @Size(min=100) and violate in by entering a shorter value in the form. You will see the errors displayed in the form.