hi Marco!
I think the instructions for checkboxes and radio buttons needs to be rewritten, because it's very confusing. You wrote "A: This feature is here since ages, for radio field just use the same name, for dropdown field read instructions in the add field area (in the plug-in)."
That sounds like we're supposed to add all of the options in the label field, just as we do for drop downs. I tried doing this three or four different ways but it didn't work.