When making the armatures for the shoulders and legs, I usually enable "X-Axis Mirror" in the options tab in edit mode and do "Shift+E" to mirror extrude the bones. Is this method doable?
Also, this has been bugging me, but it could be an issue later on. When I create the initial bone and extrude from the head of the bone, it doesn't seem to be linked to the extruded bone. I don't know if I explained that properly.