Secure transport

To answer a question I was re-examining out secure transport 
mechanisms.  It looks like the only runtime mechanism we provide allows 
a portlet to encode the secure transport requirement in its rendered 
URLs?  Is this correct?  Did we ever discuss trying to define a semantic 
[in BlockingInteraction] to allow a portlet to get equivalent behavior 
as defined by the flags in PortletDescription?  Namely, the ability to 
ensure that all links on the page reflect the secure requirement vs just 
the one's in the portlet?  If I understand things as we have them today, 
its possible for the portlet to switch to secure transport [via its URL] 
but then have the user interact with another portlet on the page that 
doesn't know/need secure transport.  At this point the choices for the 
secure portlet are limited, for example it can revert to the non-secure 
page which caused it to enter, or render a screen that let's you 
re-eneter it in secure mode.  Can anyone refresh my memory why we went 
this route vs trying to find hooks that allowed the portlet to switch 
the entire page into secure mode?  Was it just too complicated on the 
consumer to keep track of this state as you interacted with different 
portlets with different requirements?  Did we figure that most portlets 
in this situation would merely set the secureOnly flag and be done with it?
     -Mike-