Knees and elbows are a must .. yes i know there are other serious problems that you guys who are much more skilled are more concerned with .. and for something like pants and jeans the current system works fine .. but if you ever look ar making armour in real life or for a poser figure (i've done both) the elbow and knee cups don't move with either part of the leg. Having a knee cap or an elbow to parent a prop to .. even if it's really small would be great.