oh wait you are applying this shape as a morph? sorry I didn't get that at first, no you cant change the jointing for a standard morph becouse the joint effects the mesh before the morph. so the mesh is being deformed by the joint as if all its points are in their origional position. no this foot wont work as a standard morph, you could rerig the figure if the morph effected the mesh before the rig and there is a way to do this in poser. but it involves editing your cr2 Manually  what you need to do is go into the cr2, in each bodypart is your morph channel and a lot of other morph channels. as well as the joint channels at the very end, if you go in there and move your morph just below all of the joint channels, repeat that with every bodypart. I recommend cr2 Builder for modifying poser file hirarchy. http://www.geocities.co.jp/Bookend-Ohgai/9483/tool/CR2Builder/02k/index.html