Hi,
There is a way around to it. You need to create a DummyAction class which exteds Action. Onload of all the forms in the Presentation Layer can call this DummyAction for which the Validation is set to false. Once it is submited it will check for the validation and then to the ActionClass.
<action path="/testAction" type="org.apache.struts.action.Action">
<forward name="success" path="/view.jsp"/>
</action>
Then your View.jsp action mapping will have the validation to true.
Hope this will help you.
Cheers,
-Venu