hand opening and stroke rehab

I probably spend an hour or two each day just flexing my hand open with my good hand. At a stroke meeting someone joked about seeing all the survivors flexing their hands open and closed. I know there is some science behind passively moving your muscles to start neuroplasticity. See here -
http://www.ncbi.nlm.nih.gov/pubmed/15003755 With hand function probably being the most requested item to recover I wish there was some actual fact-based information on what needs to be done to recover it. It seems we are once again left hanging with 'We don't know, try something yourself'. As Sargent Schultz used to say, 'I know nuthing'.