I don't know how to work the fingers and flaps aspect of this problem, but for the joint rotation order, if you look at the raptor in its zeroed pose, Zygote created the mesh so that all the body parts were at about 90 degree angles to each other, so that they could avoid all of that. Maybe you could do the wing skin as a second parented figure? that way they would not have that 3 joints problem? -Trav