[Flow] update controller and radio button

[mario chiari]

Hi

I have a form with a radio button to update a single property/field of a
number of object/records (comments from TYPO3.Blog)
Everything works fine, if I have a separate form for each record, see at
http://pastebin.com/Fb7THSH3

Still, I would like to have a single form (a single submit button) for
several records. 
I have tried a few things, but none works (for different reasons, among
other I am not sure how to use f:form:radio within a for loop). 

very happy to hear from anybody who has already dealt with a similar
case. 
cheers thks
mario