Published By: Bill Chesnut
There has been and off and on bug with the orchestration designer since BizTalk 2006, in BizTalk 2004 the call rules shape needed to be in an Atomic scope, but that restriction was removed in BizTalk 2006, but the designer has had an off and on bug with this change.
In BizTalk 2010: (greyed out and not available)
In BizTalk 2013 Beta: (Fixed)
Thanks to the BizTalk Group for fixing my Connect Bug