Hello,
Yes, like in SceneWeaver you can import OBJ's (textured or not) into ImageModeler,
and place them, as you would do for the IM's primitives, in your calibrated scene.
I guess, 3DS was used mainly as it does rendering and animation (IM does not).
You could use any other animation package in addition to IM (not SW for this purpose).
Bye,
Stef