Hal,
If you decide that you'd like to take steps toward "wreck penetration dives", in my humble opinion you would benefit from another course. Wreck penetration may involve reel handling, line handling, communications and light/hand signals, and techniques and skills appropriate to team movement in an overhead environment. Regardless of the extent to which these topics are addressed in the PADI specialty course, I suspect they are not covered as in depth as you will find in cavern and cave training. This training is pretty conveniently located close by your location.
Suggest you think about contacting Splash Dive Center, in Alexandria, VA if this is the path you think you want to follow. Here is the link:
http://www.splashdivecenter.com/
Ron Carmichael runs a variety of cavern and cave courses that would constitute a more solid foundation for team diving in overhead environments. PM for further details.
Best,
Doc