You can use sim for stills, but be ready for frustration.  The above image was the result of using sim on the hair for that extra gravity-realism.  My skullcap has 5 groups...could probably get away with 4 though.  The more groups you have, the easier it is to use styling tools.  On the other hand, the more groups you have, the harder it is to sim it all, because each group requires a sim. 

Hope that makes sense.