I apologize already for my lame question, i tried some way with no success, tweaking with ChildCompensation and searching in google. Would be possible, after assigned an envelope or anyway after have built a whole skeleton, to modify the size ( in term of width, nothing related with the bone lenght feature in the Chain Bone property editor ) all the bones are visualized to. I was looking for some function like the Joint Size in Maya, to display directly all the bones 50%-25%-... of the original lenght. Any alternative to the bone shadow icons ?
Thanks.