"Refl.maps are needed in Poser because Firefly doesn't computer reflections from the surrounding environment."

I'm not sure what you mean by that. Reflection maps are used to fake reflections on (usually metalic) objects, but Poser certainly can and does compute reflections of the surrounding environment if set up to do so in material properties, eg. mirrors, crome, glass etc. And objects (with light emitting enabled+IDL) will "reflect" their diffuse colour to surrounding objects (radiosity).