Pulling hair to lengthen unfortunately doesn't Push it back in. Scissors would allow you to shorten length errors without having to start over. As for the style thing? It just doesn't work as a comb. For one reason, the hair doesn't collide against the skull as you push it in any direction with this tool so it doesn't "Lay" right.  I guess with a comb I'd like to see collision detection in the hair room so that you can style the hair without it going and dissappearing inside the head.