hey matt,
how you doing? Well what i do for my eyelids are that i just go ahead and model them. Then in vertex mode, i apply clusters to the eyelids, align the cluster's pivot point to the center of your eye, and animate it that way. Then if you want the "corner points" to stay still, you can just adjust the weight of those vertices that are connected to the cluster/clusters. I wouldn't personally use blendshapes for my eyelids, because it's causes a linear path from souceA to sourceB and wouldn't recreate that rotation of your eyelid.
I hope that helps.
Strytus