Adding web parts on forms pages are “banned”, there goes my MacawDiscussionBoard list template!! Welcome to the wonderful world of SharePoint!
But this one is even worse than the Site Definitions: http://weblogs.asp.net/soever/archive/2005/05/26/408948.aspx
You may not even modify the template page before instantiating, or the instance of the page after creation…. This is in my opinion again a major problem!
Time to get a list of what is unsupported, but will work…