Originally posted by stwert
One way to do it is to simply create a NURBs plane and map a file texture to it as your reference. That way you can move, scale, do whatever to it as it's actual geometry. Hope that helps.
I do the exact thing. Except I use a poly plane, that way I can map the UV's for it accordingly. Then make a layer for each plane, reference the layer, so you cant click on it to select it. The only issue there is, you cant use wireframe mode with the ref image. You'll have to adjust the transparency of the material on the object your working on to see though it.
Also, if you go into the camera properties, you can adjust the positioning of the ref image. I dont have Maya on my work computer, so Im not sure the exact "location" of the ref image properties, but I do know it can be done.