I know you can assign more than one material to a mesh, but is it possible to make one of them an image map and assign it to a subset of vertices? I can’t seem to get this to work, and I figure it’s either not possible, or I’m not setting it up right.
Yes absolutely. Just prepare your materials as usual, those with an image texture (or any material really) just as well and assign them using the buttons in the edit buttons (F9).
I have a very simple example for you ; if you want it I could send it by mail.