Correct me if I'm wrong, but out of the box, IRAD 6 only supported the Struts portlet using the old JetSpeed API.
Try to add struts support with a JetSpeed, legacy portlet project with IBM's Rational Application Developer, and you might see the WYSIWYG wizards.
Are you starting from scratch? If you are, I might recommend the
JSF portlet framework from IBM. It's my impression that IBM is much more focussed in supporting the
Java Server Faces framework, as opposed to the Struts framework.
By the way, I've got a few tutorials on creating JSF and Struts portlets using IRAD on my website. I use the Apache bridge, as opposed to the IBM infrastructure, but the fundamentals are the same. Check out my signature links.
Good luck!
-Cameron McKenzie