Unless poser 2010 changed its way of morph load I do not yet see how/why the method you mentioned works.

When you do not export as morph target, all bends will be included into the .OBJ. Even if you zero the figure, there will be influence from bends and JCMs. If you load this as a morph target and assign it a -1 value, you will bring your figure into the shape of its base .OBJ. That is kind of a fake zero.

Having this as a base you can load your morphed obj, no doubt, but I think what you get is a morph that brings your figure into a bended form again, but doing this as a morph not as a bend. If you change the pose on a figure that was deformed that way, I think your morph will explode.

One cannot replace bends with morphs, if one intends to change the pose later on.

The program was intended to remove this limitation. It does not use the -1 "trick" internally. It is directly working on the posed figure and computes the transformation required to change the shape so that it fits the morphed .OBJ.

Your -1 method seems to undo bending, but it only does it "for the moment". At least thats what I currently think.

The program btw has not many 3ds max users yet. I think someone made it run with 3dsmax9, but I have no experience on other versions.